Test and validate JavaScript regular expressions with real-time matching and syntax breakdown.
Interactive pattern evaluator with live visual highlights and substitution
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Test a JavaScript regular expression against sample text. Adjust flags, inspect matches and captured groups, or try a replacement string. The workspace uses your browser's regular-expression engine.
Fast and easy from start to finish
Enter a pattern and the text you want to test.
Set the flags and inspect match highlights or pattern errors.
Try capture groups or replacement mode, then copy the pattern you need.
What you can do with this tool
Live matches: See which portions of the sample text match.
Pattern flags: Toggle the available JavaScript flags.
Capture groups: Inspect the groups returned by each match.
Replacement preview: Try a replacement pattern without changing the source text.
Everyday walkthroughs and starter ideas for Regex Tester & Debugger
Test a digit pattern against a sample invoice number with the global flag enabled.
File requirements, capabilities, and system limits
Complex expressions or large text can slow the browser. A valid pattern can still be unsuitable for your data.
How creators, students, and professionals use Regex Tester & Debugger
Try extracting IDs from sample text.
Check a replacement before applying it elsewhere.
Answers to common questions about Regex Tester & Debugger
Not necessarily. This tool tests JavaScript expressions. Other languages can have different syntax and matching behavior.
No. A pattern checks text structure, not whether an email address, URL, or account is real.
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