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: 2026-06-23 00:26:21 UTC
- JSON Representation
https://github.com/subhadipsinha722133/whatsapp-chat-analysis
🤖 Whatsapp-Chat analysis
deep-learning matplotlib ml pandas regular-expression seborn sklearn streamlit tensorflow
Last synced: 10 Apr 2026
https://github.com/FaraazArsath/User-Registration-Login
This Python script provides a simple user registration system with username and password validation using regular expressions. It also includes a password recovery option.
filehandling if-else python regular-expression
Last synced: 26 Feb 2025
