Regex Tester Online - Free regex tester with real-time matching and highlighting.
Free online regex tester with real-time pattern matching and syntax highlighting. Test regex against custom text instantly.
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How to Use Regex Tester
- 1Enter your regex pattern in the pattern field.
- 2Type or paste test text in the input area.
- 3Matches are highlighted in real time.
Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a sequence of characters that defines a search pattern. It is used for string matching, validation, and text extraction.
Which regex flavors does this tester support?
This tester uses the JavaScript regex engine (ECMAScript). It supports most common patterns including lookaheads, character classes, and quantifiers.
Does this tool support regex flags?
Yes. You can toggle common flags: g (global), i (case-insensitive), m (multiline), s (dotAll), and u (unicode).
Found a bug or have a suggestion? Report it on GitHub