Tools/Code & Developer/Regex Tester

Regex Tester

Test your regular expressions.

100% on device · 0 uploads

Regular Expression (Regex):

Test Text:

Matches (0):

Waiting for test text...

01 · Unlimited

Use it as many times as you want — completely free.

02 · Private

Your files never leave your device; everything runs in your browser.

03 · Fast

Processing happens locally and finishes in seconds.

How to Test Regular Expressions

Type the regex with flags like g, i or m.

Add the sample text you want to match against.

Every match lights up instantly as you edit the pattern.

✓Live match highlighting as you type

✓Full flag support (g, i, m)

✓Safe for real data — 100% local

✓Instant feedback speeds up pattern building

Which regex flavor is used?+

JavaScript's — the flavor of web development. Most patterns are portable, but lookbehind and some Unicode features differ across languages.

What do the g, i, m flags mean?+

g finds all matches instead of just the first, i ignores case, m makes ^ and $ match at every line boundary.

Why does my pattern match too much?+

Usually greedy quantifiers — .* grabs as much as possible. Add ? for lazy matching (.*?) or use a more specific character class.

Is live testing safe with my data?+

Yes — matching runs entirely in your browser. Test against real logs or data without anything being uploaded.