What regex flavor do you use?

JavaScript (ECMAScript) regex syntax. Most common features work in Python, Java, and PCRE as well.

Regex Tester

Test and debug regular expressions online. Real-time matching with flags, capture groups, and replacement. Free regex tester for JavaScript, Python, and PCRE patterns.

✓ Free • No Signup • Client-Side Only

Regex Tester

Enter a regex pattern, select flags, and type your test string. Matches are highlighted in real time with a capture groups table below.

Regex Pattern

/ /

Flags

g i m s u

Common Patterns

Test String

Matches: 0

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Regex Tester

Regex Tester

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