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Free Dev Tool

Regex Cheatsheet and Tester

Learn regex by doing: click any pattern to load it, then test it live against your own text.

100% Free No signup Runs in your browser No uploads

Pattern tester

Matches found

0

Capture groups (first 10 matches)

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Highlighted matches

Cheatsheet: click any pattern to load it into the tester

Frequently asked questions

How do I use the cheatsheet?

Click any pattern chip and it loads into the tester. Edit it freely, type your test text below, and matches highlight instantly with a live count.

What do the flag letters mean?

i ignores case, m makes ^ and $ match line starts and ends, s lets the dot match newlines, and u enables full Unicode matching.

Is this the same regex as JavaScript?

Yes. The tester runs your browser's own JavaScript regex engine, so what works here works in your JS code.

Preview

Regex Cheatsheet and Tester tool preview
Live preview of the Regex Cheatsheet and Tester tool running in your browser. Your data never leaves your device.

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