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Regex Tester

Test and debug regular expressions with real-time matching and explanation.

Files never leave your deviceNo signup required

Common Patterns

Regular Expression

//gi

Global (g)Case Insensitive (i)Multiline (m)DotAll (s)

Test String

2 matches found

Visit https://example.com or http://test.org/page?q=1 for details.

#	Match	Index	Groups
1	https://example.com	6	-
2	http://test.org/page?q=1	29	-

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Master Regular Expressions

Pro includes a regex library, AI-powered pattern suggestions, and multi-language code generation.

Frequently Asked Questions

What is a regular expression?▼

A regular expression (regex) is a sequence of characters that defines a search pattern. It's used in programming for string matching, searching, and text manipulation.

What do the flags mean?▼

g (global) finds all matches, i (case-insensitive) ignores case, m (multiline) makes ^ and $ match line boundaries, s (dotAll) makes . match newlines.

How to Use Regex Tester

1Open the Regex Tester tool above - it loads instantly in your browser.
2Enter your data or upload your file. Everything is processed locally on your device - nothing is uploaded to any server.
3Get your results instantly. Copy, download, or share - completely free with no signup required.

Regex Tester is part of BriskTool's collection of free online tools. All processing runs entirely in your browser for maximum privacy and speed.

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