Regular expression
A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match 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. They 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. Regular expressions are also supported in many programming languages.
Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.
- GitHub: https://github.com/topics/regular-expression
- Wikipedia: https://en.wikipedia.org/wiki/Regular_expression
- Created by: Stephen Cole Kleene
- Released: 1950
- Related Topics: pattern-matching, wildcard, glob, grep, awk, sed,
- Aliases: regex, regexp, regular-expressions,
- Last updated: 2026-07-14 00:26:06 UTC
- JSON Representation
https://github.com/gautamjuyal/base-apparel-coming-soon
Base apparel coming soon page from frontendmentor.io Form validated using JavaScript regular expression.
javascript mixins regular-expression scss
Last synced: 27 Apr 2026
https://github.com/tttardigrado/hsderiv
Haskell implementation of Brzozowski derivatives for regular expressions.
brzozowski-derivative functional-programming haskell regex regex-matcher regular-expression theory-of-computation
Last synced: 03 Apr 2025
https://github.com/seasawher/regular-expression-derivatives-re-examined
論文を機械翻訳しただけのリポジトリ
japanese machine-translation paper regular-expression
Last synced: 05 Feb 2026
https://github.com/nagasai125/compiler-design---18csc304j-
18CSC304J Compiler Design Lab codes
dfa first-and-follow left-facto left-recursion left-recursion-elimination lexical-analysis nfa nfa-implementation nfa-to-dfa-conversion paser predictive-parsing quadruple regular-expression semantic-analysis syntax-analysis
Last synced: 10 Jun 2025
