Developer / Debugging
Regex Tester
Test regular expressions instantly with match feedback and sample text. Test patterns, toggle flags, inspect capture groups, preview replacements, and see matches highlighted in real time.
3
Matches
gm
Flags
26
Pattern chars
Valid
Regex state
Loaded sample regex
Highlighted matches
Replacement result
Match details
Why this one is useful
Seeing matches highlighted in context is much faster than guessing whether a pattern worked from a single true or false.
Replacement preview makes the tool useful for cleanup and transformation tasks, not just validation.
Capture groups, named groups, and flag toggles keep the feedback loop tight, which is the whole point of a good regex tool.
Common uses
Validating IDs, routes, and filename patterns.
Extracting values from logs, copied responses, or pasted text.
Testing multiline and case-insensitive search rules.
Previewing text replacements before writing application code.