Regex Tester & Debugger
Test and debug regular expressions with live match highlighting, capture groups, and flags. Includes common regex reference patterns. Free and client-side.
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Test String
Matches (highlighted)
Matches will be highlighted here...
Match List
No matches yet.
Common Regex Reference
\\d+
Match digits (numbers)
\\w+
Match word characters
[a-zA-Z]+
Match letters only
[^@]+@[^@]+\\.[a-z]+
Simple email pattern
https?://\\S+
Match URLs
\\d{4}-\\d{2}-\\d{2}
Date (YYYY-MM-DD)
\\b\\d{3}-\\d{4}\b
Phone (123-4567)
\\$\\d+(\\.\\d{2})?
Currency amount
FAQ
What regex engine does this use?
This tool uses the JavaScript RegExp engine built into your browser, which follows the ECMA-262 specification.
What do the flags mean?
g = global (find all matches), i = case-insensitive, m = multiline (^ and $ match line boundaries), s = dotAll (. matches newlines), u = unicode mode.
How many matches can it find?
The tool caps at 10,000 matches to prevent browser freezing on pathological patterns. Most real-world use cases stay well within this.
Can I use capture groups?
Yes. Capture groups are displayed for each match with their index and captured value.