Definitions for regular expression
reg·u·lar ex·pres·sion

WiktionaryRate this definition:0.0 / 0 votes

1. regular expressionnoun

   A concise description of a regular formal language with notations for concatenation, alternation, and iteration (repetition) of subexpressions.

2. regular expressionnoun

   Any pattern for text matching or searching, frequently offering more or less functionality than a theoretical regular expression.

WikipediaRate this definition:0.0 / 0 votes

1. Regular expression

   A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. Regular expression techniques are developed in theoretical computer science and formal language theory. The concept of regular expressions began in the 1950s, when the American mathematician Stephen Cole Kleene formalized the concept of a regular language. They came into common use with Unix text-processing utilities. Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Most general-purpose programming languages support regex capabilities either natively or via libraries, including Python, C, C++,Java, Rust, OCaml, and JavaScript.

WikidataRate this definition:0.0 / 0 votes

1. Regular expression

   In computing, a regular expression is a sequence of text characters, some of which are understood to be metacharacters with symbolic meaning, and some of which have their literal meaning, that together can automatically identify textual material of a given pattern, or process a number of instances of it that can vary from a precise equality to a very general similarity of the pattern. The pattern sequence itself is an expression that is a statement in a language designed specifically to represent prescribed targets in the most concise and flexible way to direct the automation of text processing of general text files, specific textual forms, or of random input strings. A regular expression matches a pattern to a string. It is employed in a search to identify text for further processing, such as displaying the match, or altering it; or it is employed to simply inform of the location or count. The concept arose in the 1950s, when Kleene formalized the description of a regular language, and came into common use with the Unix text processing utilities ed, an editor, and grep, a filter. A very simple use of a regular expression would be to locate the same word spelled two different ways in a text editor, for example seriali[sz]e. A wildcard match can also achieve this, but wildcard matches differ from regular expressions in that wildcards are limited to what they can pattern, whereas regular expressions are not. A usual context of wildcard characters is in globbing a similar names in a list of files, whereas regular expressions are usually employed in applications that pattern-match text strings in general. The simple regexp ^[ \t]+ matches excess whitespace on a line. An advanced regexp used to match a numeral is ^[+-]??$ .

How to pronounce regular expression?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say regular expression in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of regular expression in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of regular expression in Pythagorean Numerology is: 1

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Regular_Expression
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Regular_Expression
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=regular expression