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Regex Match Visualizer

Developer

Visualize regex matches with highlighted groups and real-time pattern testing.

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0
Pattern
Test String
Matches (0)
Enter a pattern

Highlighting matched text in a sample string shows what a pattern found, but it doesn't show how the pattern itself is actually structured, which groups nest inside which, where an alternation branches into separate options, a different question that matters once a pattern gets complicated enough that its own shape is hard to hold in your head just from reading the raw syntax. This tool visualizes a regex's matches with highlighted groups while testing in real time, making a pattern's internal structure, not just its matched output, easier to follow at a glance.

See more about the Regex Match Visualizer

Useful for understanding how a complex pattern's groups and alternation actually nest together rather than just seeing what text it matched, following exactly which capture group corresponds to which highlighted piece of a match, or making sense of an already-written pattern's internal structure before modifying it.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

Quick answers for Regex Match Visualizer

How does it show which regex tokens I am using?
Below the pattern field it lists tags for any of ten common tokens found in your pattern, like \d, \s, ^, or |, and hovering each tag reveals a plain-language description such as "Digit" or "Start".
How do I set flags like case-insensitive matching?
Flags are typed directly into a small text field next to the pattern input, defaulting to "g", rather than picked from a list of toggle buttons.
What happens if my pattern is invalid?
An error message with the JavaScript engine's own error text appears below the pattern field instead of a match count.