slovodefinícia
expression
(mass)
expression
- vyjadrovanie, prejav, vyjadrenie, výraz
expression
(encz)
expression,projev
expression
(encz)
expression,vyjádření Hynek Hanke
expression
(encz)
expression,vyjadřování
expression
(encz)
expression,výraz n: [mat.]
Expression
(gcide)
Expression \Ex*pres"sion\ ([e^]ks*pr[e^]sh"[u^]n), n. [L.
expressio: cf. F. expression.]
1. The act of expressing; the act of forcing out by pressure;
as, the expression of juices or oils; also, of extorting
or eliciting; as, a forcible expression of truth.
[1913 Webster]

2. The act of declaring or signifying; declaration;
utterance; as, an expression of the public will.
[1913 Webster]

With this tone of philosophy were mingled
expressions of sympathy. --Prescott.
[1913 Webster]

3. Lively or vivid representation of meaning, sentiment, or
feeling, etc.; significant and impressive indication,
whether by language, appearance, or gesture; that manner
or style which gives life and suggestive force to ideas
and sentiments; as, he reads with expression; her
performance on the piano has expression.
[1913 Webster]

The imitators of Shakespeare, fixing their attention
on his wonderful power of expression, have directed
their imitation to this. --M. Arnold.
[1913 Webster]

4. That which is expressed by a countenance, a posture, a
work of art, etc.; look, as indicative of thought or
feeling. "The expression of an eye." --Tennyson.
[1913 Webster]

It still wore the majesty of expression so
conspicuous in his portraits by the inimitable
pencil of Titian. --Prescott.
[1913 Webster]

5. A form of words in which an idea or sentiment is conveyed;
a mode of speech; a phrase; as, a common expression; an
odd expression.
[1913 Webster]

6. (Math.) The representation of any quantity or relation by
appropriate characters or symbols, usually in a specific
order.
[1913 Webster +PJC]

7. (Genetics) the production of products by a gene that cause
the appearance of the corresponding protein or phenotype;
-- of a gene or of an organism with a specific gene; as,
the expression the beta-galactosidase positive phenotype,
[PJC]

8. (Computers) a combination of characters linked by
operators, occurring as part of the code of a computer
program, which must be evaluated according to the rules of
the computer language in order to produce a resulting
value.
[PJC]

Note: In most programming languages, (a + b) is an expression
indicating simple arithmetic addition, if the variables
a and b are real numbers. Many other types of operation
may be used in programs, and each set of symbols
indicating an operation is an expression in that
program.
[PJC]

Past expression, Beyond expression, beyond the power of
description. "Beyond expression bright." --Milton.
[1913 Webster]
expression
(wn)
expression
n 1: the feelings expressed on a person's face; "a sad
expression"; "a look of triumph"; "an angry face" [syn:
expression, look, aspect, facial expression,
face]
2: expression without words; "tears are an expression of grief";
"the pulse is a reflection of the heart's condition" [syn:
expression, manifestation, reflection, reflexion]
3: the communication (in speech or writing) of your beliefs or
opinions; "expressions of good will"; "he helped me find
verbal expression for my ideas"; "the idea was immediate but
the verbalism took hours" [syn: expression, {verbal
expression}, verbalism]
4: a word or phrase that particular people use in particular
situations; "pardon the expression" [syn: saying,
expression, locution]
5: the style of expressing yourself; "he suggested a better
formulation"; "his manner of expression showed how much he
cared" [syn: formulation, expression]
6: a group of symbols that make a mathematical statement [syn:
formula, expression]
7: (genetics) the process of expressing a gene
8: a group of words that form a constituent of a sentence and
are considered as a single unit; "I concluded from his
awkward constructions that he was a foreigner" [syn:
construction, grammatical construction, expression]
[ant: misconstruction]
9: the act of forcing something out by squeezing or pressing;
"the expression of milk from her breast"
expression
(foldoc)
expression

Any piece of program code in a {high-level
language} which, when (if) its execution terminates, returns a
value. In most programming languages, expressions consist of
constants, variables, operators, functions, and parentheses.
The operators and functions may be built-in or user defined.
Languages differ on how expressions of different types may
be combined - with some combination of explicit casts and
implicit coercions.

The syntax of expressions generally follows conventional
mathematical notation, though some languages such as Lisp or
Forth have their own idiosyncratic syntax.

(2001-05-14)
EXPRESSION
(bouvier)
EXPRESSION. The term or use of language employed to explain a thing.
2. It is a general rule, that expressions shall be construed, when they
are capable of several significations, so as to give operation to the
agreement, act, or will, if it can be done; and an expression is always to
be understood in the sense most agreeable to the nature of the contract.
Vide Clause; Construction; Equivocal; Interpretation; Words.

podobné slovodefinícia
expression
(mass)
expression
- vyjadrovanie, prejav, vyjadrenie, výraz
selfexpression
(mass)
self-expression
- sebe reprezentácia
abstract expressionism
(encz)
abstract expressionism,abstraktní expresionismus umělecký směr mikosoft
as an expression of goodwill
(encz)
as an expression of goodwill,jako výraz dobré vůle [fráz.] Pino
exponential expression
(encz)
exponential expression, n:
expression
(encz)
expression,projev expression,vyjádření Hynek Hankeexpression,vyjadřování expression,výraz n: [mat.]
expressionism
(encz)
expressionism,expresionizmus n: Zdeněk Brož
expressionist
(encz)
expressionist,expresionista n: Zdeněk Brožexpressionist,expresionistický adj: Zdeněk Brož
expressionistic
(encz)
expressionistic,expresionistický adj: Zdeněk Brož
expressionless
(encz)
expressionless,bezvýrazný adj: Zdeněk Brož
expressionlessly
(encz)
expressionlessly,bezvýrazně adv: Zdeněk Brož
expressions
(encz)
expressions,výrazy n: pl. Zdeněk Brož
facial expression
(encz)
facial expression,mimika
gene expression
(encz)
gene expression, n:
idiomatic expression
(encz)
idiomatic expression, n:
indirect expression
(encz)
indirect expression, n:
juridical expression
(encz)
juridical expression,právní jazyk [práv.] xkomczax
neoexpressionism
(encz)
neoexpressionism, n:
parenthetical expression
(encz)
parenthetical expression, n:
put on a expression
(encz)
put on a expression,
regular expression
(encz)
regular expression,regulární výraz [it.]
self-expression
(encz)
self-expression,sebereprezentace n: Zdeněk Brož
subexpression
(encz)
subexpression,podvýraz luke
subexpressions
(encz)
subexpressions,podvýrazy n: pl. luke
supra expressionism
(encz)
supra expressionism, n:
without expression
(encz)
without expression, adv:
Beyond expression
(gcide)
Expression \Ex*pres"sion\ ([e^]ks*pr[e^]sh"[u^]n), n. [L.
expressio: cf. F. expression.]
1. The act of expressing; the act of forcing out by pressure;
as, the expression of juices or oils; also, of extorting
or eliciting; as, a forcible expression of truth.
[1913 Webster]

2. The act of declaring or signifying; declaration;
utterance; as, an expression of the public will.
[1913 Webster]

With this tone of philosophy were mingled
expressions of sympathy. --Prescott.
[1913 Webster]

3. Lively or vivid representation of meaning, sentiment, or
feeling, etc.; significant and impressive indication,
whether by language, appearance, or gesture; that manner
or style which gives life and suggestive force to ideas
and sentiments; as, he reads with expression; her
performance on the piano has expression.
[1913 Webster]

The imitators of Shakespeare, fixing their attention
on his wonderful power of expression, have directed
their imitation to this. --M. Arnold.
[1913 Webster]

4. That which is expressed by a countenance, a posture, a
work of art, etc.; look, as indicative of thought or
feeling. "The expression of an eye." --Tennyson.
[1913 Webster]

It still wore the majesty of expression so
conspicuous in his portraits by the inimitable
pencil of Titian. --Prescott.
[1913 Webster]

5. A form of words in which an idea or sentiment is conveyed;
a mode of speech; a phrase; as, a common expression; an
odd expression.
[1913 Webster]

6. (Math.) The representation of any quantity or relation by
appropriate characters or symbols, usually in a specific
order.
[1913 Webster +PJC]

7. (Genetics) the production of products by a gene that cause
the appearance of the corresponding protein or phenotype;
-- of a gene or of an organism with a specific gene; as,
the expression the beta-galactosidase positive phenotype,
[PJC]

8. (Computers) a combination of characters linked by
operators, occurring as part of the code of a computer
program, which must be evaluated according to the rules of
the computer language in order to produce a resulting
value.
[PJC]

Note: In most programming languages, (a + b) is an expression
indicating simple arithmetic addition, if the variables
a and b are real numbers. Many other types of operation
may be used in programs, and each set of symbols
indicating an operation is an expression in that
program.
[PJC]

Past expression, Beyond expression, beyond the power of
description. "Beyond expression bright." --Milton.
[1913 Webster]
Expression
(gcide)
Expression \Ex*pres"sion\ ([e^]ks*pr[e^]sh"[u^]n), n. [L.
expressio: cf. F. expression.]
1. The act of expressing; the act of forcing out by pressure;
as, the expression of juices or oils; also, of extorting
or eliciting; as, a forcible expression of truth.
[1913 Webster]

2. The act of declaring or signifying; declaration;
utterance; as, an expression of the public will.
[1913 Webster]

With this tone of philosophy were mingled
expressions of sympathy. --Prescott.
[1913 Webster]

3. Lively or vivid representation of meaning, sentiment, or
feeling, etc.; significant and impressive indication,
whether by language, appearance, or gesture; that manner
or style which gives life and suggestive force to ideas
and sentiments; as, he reads with expression; her
performance on the piano has expression.
[1913 Webster]

The imitators of Shakespeare, fixing their attention
on his wonderful power of expression, have directed
their imitation to this. --M. Arnold.
[1913 Webster]

4. That which is expressed by a countenance, a posture, a
work of art, etc.; look, as indicative of thought or
feeling. "The expression of an eye." --Tennyson.
[1913 Webster]

It still wore the majesty of expression so
conspicuous in his portraits by the inimitable
pencil of Titian. --Prescott.
[1913 Webster]

5. A form of words in which an idea or sentiment is conveyed;
a mode of speech; a phrase; as, a common expression; an
odd expression.
[1913 Webster]

6. (Math.) The representation of any quantity or relation by
appropriate characters or symbols, usually in a specific
order.
[1913 Webster +PJC]

7. (Genetics) the production of products by a gene that cause
the appearance of the corresponding protein or phenotype;
-- of a gene or of an organism with a specific gene; as,
the expression the beta-galactosidase positive phenotype,
[PJC]

8. (Computers) a combination of characters linked by
operators, occurring as part of the code of a computer
program, which must be evaluated according to the rules of
the computer language in order to produce a resulting
value.
[PJC]

Note: In most programming languages, (a + b) is an expression
indicating simple arithmetic addition, if the variables
a and b are real numbers. Many other types of operation
may be used in programs, and each set of symbols
indicating an operation is an expression in that
program.
[PJC]

Past expression, Beyond expression, beyond the power of
description. "Beyond expression bright." --Milton.
[1913 Webster]
Expressional
(gcide)
Expressional \Ex*pres"sion*al\ (-al), a.
Of, or relating to, expression; phraseological; also, vividly
representing or suggesting an idea or sentiment. --Fitzed.
Hall. --Ruskin.
[1913 Webster]
expressionism
(gcide)
expressionism \expressionism\ n.
1. an art movement early in the 20th century; the artist's
subjective expression of inner experiences was emphasized.
[WordNet 1.5]

2. a genre of German painting that tried to show the
subjective responses to scenes rather than the scenes
themselves.
[WordNet 1.5] expressionist
expressionist
(gcide)
expressionist \expressionist\ n.
an artist who is an adherent of expressionism.
[WordNet 1.5]expressionist \expressionist\ expressionistic
\expressionistic\adj.
1. of or pertaining to expressionism (definition 2); as,
expressionist art.
[WordNet 1.5]
expressionistic
(gcide)
expressionist \expressionist\ expressionistic
\expressionistic\adj.
1. of or pertaining to expressionism (definition 2); as,
expressionist art.
[WordNet 1.5]
Expressionless
(gcide)
Expressionless \Ex*pres"sion*less\, a.
Destitute of expression.
[1913 Webster]
Imaginary expression
(gcide)
Imaginary \Im*ag"i*na*ry\, a. [L. imaginarius: cf. F.
imaginaire.]
Existing only in imagination or fancy; not real; fancied;
visionary; ideal.
[1913 Webster]

Wilt thou add to all the griefs I suffer
Imaginary ills and fancied tortures? --Addison.
[1913 Webster]

Imaginary calculus See under Calculus.

Imaginary expression or Imaginary quantity (Alg.), an
algebraic expression which involves the impossible
operation of taking the square root of a negative
quantity; as, [root]-9, a + b [root]-1.

Imaginary points, lines, surfaces, etc. (Geom.),
points, lines, surfaces, etc., imagined to exist, although
by reason of certain changes of a figure they have in fact
ceased to have a real existence.

Syn: Ideal; fanciful; chimerical; visionary; fancied; unreal;
illusive.
[1913 Webster]
Misexpression
(gcide)
Misexpression \Mis`ex*pres"sion\, n.
Wrong expression.
[1913 Webster]
Past expression
(gcide)
Expression \Ex*pres"sion\ ([e^]ks*pr[e^]sh"[u^]n), n. [L.
expressio: cf. F. expression.]
1. The act of expressing; the act of forcing out by pressure;
as, the expression of juices or oils; also, of extorting
or eliciting; as, a forcible expression of truth.
[1913 Webster]

2. The act of declaring or signifying; declaration;
utterance; as, an expression of the public will.
[1913 Webster]

With this tone of philosophy were mingled
expressions of sympathy. --Prescott.
[1913 Webster]

3. Lively or vivid representation of meaning, sentiment, or
feeling, etc.; significant and impressive indication,
whether by language, appearance, or gesture; that manner
or style which gives life and suggestive force to ideas
and sentiments; as, he reads with expression; her
performance on the piano has expression.
[1913 Webster]

The imitators of Shakespeare, fixing their attention
on his wonderful power of expression, have directed
their imitation to this. --M. Arnold.
[1913 Webster]

4. That which is expressed by a countenance, a posture, a
work of art, etc.; look, as indicative of thought or
feeling. "The expression of an eye." --Tennyson.
[1913 Webster]

It still wore the majesty of expression so
conspicuous in his portraits by the inimitable
pencil of Titian. --Prescott.
[1913 Webster]

5. A form of words in which an idea or sentiment is conveyed;
a mode of speech; a phrase; as, a common expression; an
odd expression.
[1913 Webster]

6. (Math.) The representation of any quantity or relation by
appropriate characters or symbols, usually in a specific
order.
[1913 Webster +PJC]

7. (Genetics) the production of products by a gene that cause
the appearance of the corresponding protein or phenotype;
-- of a gene or of an organism with a specific gene; as,
the expression the beta-galactosidase positive phenotype,
[PJC]

8. (Computers) a combination of characters linked by
operators, occurring as part of the code of a computer
program, which must be evaluated according to the rules of
the computer language in order to produce a resulting
value.
[PJC]

Note: In most programming languages, (a + b) is an expression
indicating simple arithmetic addition, if the variables
a and b are real numbers. Many other types of operation
may be used in programs, and each set of symbols
indicating an operation is an expression in that
program.
[PJC]

Past expression, Beyond expression, beyond the power of
description. "Beyond expression bright." --Milton.
[1913 Webster]
To reduce an expression
(gcide)
Reduce \Re*duce"\ (r[-e]*d[=u]s"), v. t. [imp. & p. p. Reduced
(-d[=u]st"),; p. pr. & vb. n. Reducing (-d[=u]"s[i^]ng).]
[L. reducere, reductum; pref. red-. re-, re- + ducere to
lead. See Duke, and cf. Redoubt, n.]
1. To bring or lead back to any former place or condition.
[Obs.]
[1913 Webster]

And to his brother's house reduced his wife.
--Chapman.
[1913 Webster]

The sheep must of necessity be scattered, unless the
great Shephered of souls oppose, or some of his
delegates reduce and direct us. --Evelyn.
[1913 Webster]

2. To bring to any inferior state, with respect to rank,
size, quantity, quality, value, etc.; to diminish; to
lower; to degrade; to impair; as, to reduce a sergeant to
the ranks; to reduce a drawing; to reduce expenses; to
reduce the intensity of heat. "An ancient but reduced
family." --Sir W. Scott.
[1913 Webster]

Nothing so excellent but a man may fasten upon
something belonging to it, to reduce it.
--Tillotson.
[1913 Webster]

Having reduced
Their foe to misery beneath their fears. --Milton.
[1913 Webster]

Hester Prynne was shocked at the condition to which
she found the clergyman reduced. --Hawthorne.
[1913 Webster]

3. To bring to terms; to humble; to conquer; to subdue; to
capture; as, to reduce a province or a fort.
[1913 Webster]

4. To bring to a certain state or condition by grinding,
pounding, kneading, rubbing, etc.; as, to reduce a
substance to powder, or to a pasty mass; to reduce fruit,
wood, or paper rags, to pulp.
[1913 Webster]

It were but right
And equal to reduce me to my dust. --Milton.
[1913 Webster]

5. To bring into a certain order, arrangement,
classification, etc.; to bring under rules or within
certain limits of descriptions and terms adapted to use in
computation; as, to reduce animals or vegetables to a
class or classes; to reduce a series of observations in
astronomy; to reduce language to rules.
[1913 Webster]

6. (Arith.)
(a) To change, as numbers, from one denomination into
another without altering their value, or from one
denomination into others of the same value; as, to
reduce pounds, shillings, and pence to pence, or to
reduce pence to pounds; to reduce days and hours to
minutes, or minutes to days and hours.
(b) To change the form of a quantity or expression without
altering its value; as, to reduce fractions to their
lowest terms, to a common denominator, etc.
[1913 Webster]

7. (Chem.) To add an electron to an atom or ion.
Specifically: To remove oxygen from; to deoxidize.
(Metallurgy) To bring to the metallic state by separating
from combined oxygen and impurities; as, metals are
reduced from their ores. (Chem.) To combine with, or to
subject to the action of, hydrogen or any other reducing
agent; as, ferric iron is reduced to ferrous iron;
aldehydes can be reduced to alcohols by lithium hydride;
-- opposed to oxidize.
[1913 Webster +PJC]

8. (Med.) To restore to its proper place or condition, as a
displaced organ or part; as, to reduce a dislocation, a
fracture, or a hernia.
[1913 Webster]

Reduced iron (Chem.), metallic iron obtained through
deoxidation of an oxide of iron by exposure to a current
of hydrogen or other reducing agent. When hydrogen is used
the product is called also iron by hydrogen.

To reduce an equation (Alg.), to bring the unknown quantity
by itself on one side, and all the known quantities on the
other side, without destroying the equation.

To reduce an expression (Alg.), to obtain an equivalent
expression of simpler form.

To reduce a square (Mil.), to reform the line or column
from the square.
[1913 Webster]

Syn: To diminish; lessen; decrease; abate; shorten; curtail;
impair; lower; subject; subdue; subjugate; conquer.
[1913 Webster]
abstract expressionism
(wn)
Abstract Expressionism
n 1: a New York school of painting characterized by freely
created abstractions; the first important school of
American painting to develop independently of European
styles [syn: Abstract Expressionism, action painting]
exponential expression
(wn)
exponential expression
n 1: a mathematical expression consisting of a constant
(especially e) raised to some power
expression
(wn)
expression
n 1: the feelings expressed on a person's face; "a sad
expression"; "a look of triumph"; "an angry face" [syn:
expression, look, aspect, facial expression,
face]
2: expression without words; "tears are an expression of grief";
"the pulse is a reflection of the heart's condition" [syn:
expression, manifestation, reflection, reflexion]
3: the communication (in speech or writing) of your beliefs or
opinions; "expressions of good will"; "he helped me find
verbal expression for my ideas"; "the idea was immediate but
the verbalism took hours" [syn: expression, {verbal
expression}, verbalism]
4: a word or phrase that particular people use in particular
situations; "pardon the expression" [syn: saying,
expression, locution]
5: the style of expressing yourself; "he suggested a better
formulation"; "his manner of expression showed how much he
cared" [syn: formulation, expression]
6: a group of symbols that make a mathematical statement [syn:
formula, expression]
7: (genetics) the process of expressing a gene
8: a group of words that form a constituent of a sentence and
are considered as a single unit; "I concluded from his
awkward constructions that he was a foreigner" [syn:
construction, grammatical construction, expression]
[ant: misconstruction]
9: the act of forcing something out by squeezing or pressing;
"the expression of milk from her breast"
expressionism
(wn)
expressionism
n 1: an art movement early in the 20th century; the artist's
subjective expression of inner experiences was emphasized;
an inner feeling was expressed through a distorted
rendition of reality
expressionist
(wn)
expressionist
adj 1: of or relating to expressionism; "expressionist art"
[syn: expressionist, expressionistic]
n 1: an artist who is an adherent of expressionism
expressionistic
(wn)
expressionistic
adj 1: of or relating to expressionism; "expressionist art"
[syn: expressionist, expressionistic]
expressionless
(wn)
expressionless
adj 1: deliberately impassive in manner; "deadpan humor"; "his
face remained expressionless as the verdict was read"
[syn: deadpan, expressionless, impassive, {poker-
faced}, unexpressive]
facial expression
(wn)
facial expression
n 1: a gesture executed with the facial muscles [syn: {facial
expression}, facial gesture]
2: the feelings expressed on a person's face; "a sad
expression"; "a look of triumph"; "an angry face" [syn:
expression, look, aspect, facial expression, face]
gene expression
(wn)
gene expression
n 1: conversion of the information encoded in a gene first into
messenger RNA and then to a protein
idiomatic expression
(wn)
idiomatic expression
n 1: an expression whose meanings cannot be inferred from the
meanings of the words that make it up [syn: idiom,
idiomatic expression, phrasal idiom, set phrase,
phrase]
indirect expression
(wn)
indirect expression
n 1: an indirect way of expressing something [syn:
circumlocution, indirect expression]
neoexpressionism
(wn)
neoexpressionism
n 1: an art movement based on expressionism; developed in 1980s
in Europe and United States; crudely drawn garish paintings
parenthetical expression
(wn)
parenthetical expression
n 1: an expression in parentheses; "his writing was full of
parentheticals" [syn: parenthetical expression,
parenthetical]
self-expression
(wn)
self-expression
n 1: the expression of one's individuality (usually through
creative activities)
slang expression
(wn)
slang expression
n 1: informal language consisting of words and expressions that
are not considered appropriate for formal occasions; often
vituperative or vulgar; "their speech was full of slang
expressions" [syn: slang, slang expression, {slang
term}]
supra expressionism
(wn)
supra expressionism
n 1: a movement that tried to go beyond expressionism
turn of expression
(wn)
turn of expression
n 1: a distinctive spoken or written expression; "John's
succinct turn of phrase persuaded her that it would not be
a good idea" [syn: turn of phrase, turn of expression]
verbal expression
(wn)
verbal expression
n 1: the communication (in speech or writing) of your beliefs or
opinions; "expressions of good will"; "he helped me find
verbal expression for my ideas"; "the idea was immediate
but the verbalism took hours" [syn: expression, {verbal
expression}, verbalism]
expression
(foldoc)
expression

Any piece of program code in a {high-level
language} which, when (if) its execution terminates, returns a
value. In most programming languages, expressions consist of
constants, variables, operators, functions, and parentheses.
The operators and functions may be built-in or user defined.
Languages differ on how expressions of different types may
be combined - with some combination of explicit casts and
implicit coercions.

The syntax of expressions generally follows conventional
mathematical notation, though some languages such as Lisp or
Forth have their own idiosyncratic syntax.

(2001-05-14)
expression tree
(foldoc)
expression tree

The syntax tree of an expression.

(1998-11-14)
lambda expression
(foldoc)
lambda expression

A term in the lambda-calculus denoting an
unnamed function (a "lambda abstraction"), a variable or a
constant. The pure lambda-calculus has only functions and
no constants.

(1995-04-13)
m-expression lisp
(foldoc)
M-expression LISP

(MLISP) The original "meta-language" syntax of Lisp,
designed by John McCarthy in 1962. MLISP was intended for
external use in place of the parenthesised S-expression
syntax.

["LISP 1.5 Programmer's Manual", J. McCarthy et al, MIT Press
1962].

(1994-11-22)
maximal free expression
(foldoc)
maximal free expression
MFE

(MFE) A free expression is sub-expression of a {lambda
abstraction} not containing the bound variable. A maximal
free expression is a free expression not contained within any
other free expression. See full laziness.
regular expression
(foldoc)
regular expression
RE

1. (regexp, RE) One of the {wild
card} patterns used by Perl and other languages, following
Unix utilities such as grep, sed, and awk and editors
such as vi and Emacs. Regular expressions use conventions
similar to but more elaborate than those described under
glob. A regular expression is a sequence of characters with
the following meanings (in Perl, other flavours vary):

An ordinary character (not one of the special characters
discussed below) matches that character.

A backslash (\) followed by any special character matches the
special character itself. The special characters are:

"." matches any character except newline; "RE*" (where RE is any
regular expression and the "*" is called the "Kleene star")
matches zero or more occurrences of RE. If there is any choice,
the longest leftmost matching string is chosen.

"^" at the beginning of an RE matches the start of a line and
"$" at the end of an RE matches the end of a line.

[CHARS] matches any one of the characters in CHARS. If the
first character of the string is a "^" it matches any
character except the remaining characters in the string (and
also usually excluding newline). "-" may be used to indicate
a range of consecutive ASCII characters.

(RE) matches whatever RE matches and \N, where N is a digit,
matches whatever was matched by the RE between the Nth "(" and
its corresponding ")" earlier in the same RE. Many flavours
use \(RE\) instead of just (RE).

The concatenation of REs is a RE that matches the
concatenation of the strings matched by each RE. RE1 | RE2
matches whatever RE1 or RE2 matches.

\< matches the beginning of a word and \> matches the end of a
word. Many flavours use "\b" instead as the special character
for "word boundary".

RE\M\ matches M occurences of RE. RE\M,\ matches M or more
occurences of RE. RE\M,N\ matches between M and N occurences.
Other flavours use RE\\M\\ etc.

Perl provides several "quote-like" operators for writing
REs, including the common // form and less common ??.

A comprehensive survey of regexp flavours is found in Friedl
1997 (see below).

[Jeffrey E.F. Friedl, "{Mastering Regular Expressions
(http://enterprise.ic.gc.ca/~jfriedl/regex/index.html)},
O'Reilly, 1997].

2. Any description of a pattern composed from combinations
of symbols and the three operators:

Concatenation - pattern A concatenated with B matches a match
for A followed by a match for B.

Or - pattern A-or-B matches either a match for A or a match
for B.

Closure - zero or more matches for a pattern.

The earliest form of regular expressions (and the term itself)
were invented by mathematician Stephen Cole Kleene in the
mid-1950s, as a notation to easily manipulate "regular sets",
formal descriptions of the behaviour of {finite state
machines}, in regular algebra.

[S.C. Kleene, "Representation of events in nerve nets and
finite automata", 1956, Automata Studies. Princeton].

[J.H. Conway, "Regular algebra and finite machines", 1971, Eds
Chapman & Hall].

[Sedgewick, "Algorithms in C", page 294].

(2015-04-30)
regular expression converter
(foldoc)
CONVERT
REC
Regular Expression Converter

1. (Or "REC", "Regular Expression Converter") A
string processing language that combined the {pattern
matching} and transformation operations of COMIT with the
recursive data structures of Lisp.

["Convert", A. Guzman et al, CACM 9(8):604-615, Aug 1966].

2. An early language to convert programs and data from one
language to another.

["CONVERT Manual", OLI Systems Inc, Oct 1976].

(2007-02-05)
string expression interpreter
(foldoc)
String Oriented Symbolic Language
SEXI
SNOBOL
String EXpression Interpreter

(SNOBOL) A string processing language for text
and formula manipulation, developed by David J. Farber, Ralph E.
Griswold and Ivan P. Polonsky at Bell Labs in 1962.

SNOBOL had only simple control structures but provided a
rich string-matching formalism of power comparable to {regular
expressions} but implemented differently. People used it
for simple natural language processing analysis tasks well
into the 1980s. Since then, Perl has come into favour for
such tasks.

SNOBOL was originally called "SEXI" - String EXpression
Interpreter. In spite of the suggestive name, SNOBOL is not
related to COBOL. Farber said the name SNOBOL was largely
contrived at the time the original JACM article was published
when one of the implementors said something like, "This
program doesn't have a snowball's chance in hell of ...". The
expansion to "String Oriented Symbolic Language" was contrived
later.

Implementations include (in no particular order): SNOBOL2,
SNOBOL3, SNOBOL4, FASBOL, SITBOL, MAINBOL, SPITBOL
and vanilla.

See also EZ, Poplar, SIL and Icon.

SNOBOL 4 (http://snobol4.org/).

David Farber (http://cis.upenn.edu/%7Efarber/).

Ralph Griswold (http://cs.arizona.edu/people/ralph/).

["SNOBOL, A String Manipulating Language", R. Griswold et al,
J ACM 11(1):21, Jan 1964].

(2004-04-29)
zf expression
(foldoc)
ZF expression

(After Zermelo Fränkel set theory). {David
Turner}'s name for list comprehension.

(1995-03-27)

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