Regex Tester
Validate, test, and match regular expressions against input texts in real-time. Review matched indexes and capture groups.
Regex Builder
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Regex Modifiers (Flags)
Interactive Highlight Preview
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Matches Found (0)
No matching substrings found.
Frequently Asked Questions
How does the Regex tester work?
Enter your regular expression and test string. The tool compiles it as a JavaScript RegExp object and highlights matching strings in real-time.
Which flags are supported?
Standard JavaScript flags: Global (g), Case-insensitive (i), Multiline (m), Single-line/dotAll (s), and Unicode (u) are supported.