Regex Tester & Explainer
Test regular expressions with live match highlighting and plain-English explanations for every token in your pattern.
Your files never leave your device. Processed locally. 100% private.
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How To Use Regex Tester & Explainer
Complete your task perfectly in just three straightforward steps.
Enter Pattern
Type your regex or choose from the 12-pattern library.
Paste Test Text
Enter text to match against — all matches highlight in real time.
Read the Explainer
Every regex token gets a plain-English label: anchor, quantifier, group, class, escape, literal.
FAQ
Everything you need to know about the Regex Tester & Explainer.
Is my data uploaded?
No. Uses the native browser JavaScript RegExp engine — nothing is sent to any server.
Which flags are supported?
g (global), i (case-insensitive), m (multiline), s (dotAll).
What patterns are in the library?
12 pre-built: email, URL, phone, date, IPv4, hex colour, credit card, HTML tags, and more.
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