How many matches are shown?

Up to 50 matches are shown in the match list. Highlighting shows all matches. The match count shows the true total.

Regex Tester — Test Regular Expressions Online

Pattern

/ /

Test string

Highlighted matches

About the Regex Tester

Regular expressions (regex) are patterns used to match character combinations in text. This tester lets you write a pattern, set flags, and instantly see all matches highlighted in your test string — no need to run code.

Common flags

g — global: find all matches, not just the first
i — case-insensitive
m — multiline: ^ and $ match line boundaries
s — dotAll: . matches newline characters too

Capture groups

Parentheses create capture groups. The tester shows each group value ($1, $2 etc.) next to every match in the match list.

Frequently Asked Questions

What regex flavour does this use?

JavaScript ECMAScript RegExp — supports groups, lookaheads, lookabehinds, and named captures.

What do the flags mean?

g=global, i=case-insensitive, m=multiline, s=dotAll, u=unicode, y=sticky.

Are my patterns saved?

No. Everything runs in your browser. Nothing is stored or sent anywhere.

Developer Tools

Regex Tester JWT Decoder Timestamp URL Slug Cron Builder Hash Generator JSON Formatter Base64 URL Encoder UUID Generator