regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
RegExr: Learn, Build, & Test RegEx
Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.
How to deal with Polish Characters while using regex?
Jun 10, 2010 · I have street name as KRZYWOŃ ANIELI and so what should be my regex to allow this kind of expression. Currently I have simple one which uses /^ [a-zA-Z ]+$/ Kindly advise.
Regular expression syntax cheat sheet - JavaScript | MDN
Mar 17, 2026 · For example, [^abc] is the same as [^a-c]. They initially match "o" in "bacon" and "h" in "chop". Note: The ^ character may also indicate the beginning of input. Wildcard: Matches any single …
Regular expression HOWTO — Python 3.14.3 documentation
Apr 6, 2026 · Regular expressions (called REs, or regexes, or regex patterns) are essentially a tiny, highly specialized programming language embedded inside Python and made available through the …
Regex Tutorial - How to write Regular Expressions
Dec 22, 2025 · A regular expression (regex) is a sequence of characters that defines a search pattern. It is mainly used for pattern matching in strings, such as finding, replacing, or validating text. Regex is …
Regex Tutorial - A Cheatsheet with Examples - Regextutorial.org
This regex will match all numbers which are two digit, three digit, four digit and five digit and it will not match one digit or six digit numbers. The last case is when you have minimum number of digits …
Regular-Expressions.info - Regex Tutorial, Examples and Reference ...
Jan 9, 2026 · In most applications, the replacement text supports special syntax that allows you to reuse the text matched by the regular expression or parts thereof in the replacement. This website also …
Regex Generator - Creating regex is easy again!
A tool to generate simple regular expressions from sample text. Enable less experienced developers to create regex smoothly.
Regex for Letters, Numbers, Underscores, Dashes, Spaces, and Polish ...
Learn how to create a regular expression that matches strings with letters, numbers, spaces, underscores, dashes, and Polish letters.