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Regular expression - Wikipedia
A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that define a search pattern.Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.It is a technique developed in theoretical computer science and formal language theory.
RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details.
What is a Regex (Regular Expression)? - Computer Hope
Short for regular expression, a regex is a string of text that allows you to create patterns that help match, locate, and manage text. Perl is a great example of a programming language that utilizes regular expressions. However, its only one of the many places you can find regular expressions.
Regex tutorial — A quick cheatsheet by examples - Factory ...
Regular expressions (regex or regexp) are extremely useful in extracting information from any text by searching for one or more matches of a specific search pattern (i.e. a specific sequence of...
Online regex tester and debugger: PHP, PCRE, Python ...
Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript.
Regular expressions quick reference
Regular expressions (shortened as "regex") are special strings representing a pattern to be matched in a search operation. They are an important tool in a wide variety of computing applications, from programming languages like Java and Perl, to text processing tools like grep, sed, and the text editor vim.
Regex Class (System.Text.RegularExpressions) | Microsoft Docs
A Regex object is immutable; when you instantiate a Regex object with a regular expression, that object's regular expression cannot be changed. By supplying both the regular expression and the text to search to a static (Shared in Visual Basic) Regex method. This enables you to use a regular expression without explicitly creating a Regex object.
Regex Cheat Sheet -
For a full reference to the particular regex flavors you'll be using, it's always best to go straight to the source. In fact, for some regex engines (such as Perl, PCRE, Java and.NET) you may want to check once a year, as their creators often introduce new features.
Regular Expression Language - Quick Reference | Microsoft Docs
A regular expression is a pattern that the regular expression engine attempts to match in input text. A pattern consists of one or more character literals, operators, or constructs. For a brief introduction, see.NET Regular Expressions.
regex - How .* (dot star) works? - Stack Overflow
In Regex,. refers to any character, be it a number, an aplhabet character, or any other special character. * means zero or more times. – asgs Oct 1 '12 at 2:08 2 It's simple enough - any symbol, present zero or more times - but there's a ton of nuances under that. What's more, it's an extremely central concept in regular expressions.