toolready

Regex Tester

Test JavaScript regex live — see matches highlighted and capture groups expanded.

/ /
Highlighted
 
  
 

Matches  
 
 
 
  
 
 
What this does
 

Edit the pattern, flags, or test string and watch matches highlight live.
  Each match expands to show its capture groups (positional $1, $2
and named ?<name>).

 
Flag reference
 
     
  • g — global. Find all matches (we always add this internally so the counter works).
    •  
  • i — ignore case.
    •  
  • m — multiline. ^ and $ match start/end of each line.
    •  
  • s — dotall. . matches newlines.
    •  
  • u — unicode. Treats the pattern as a sequence of Unicode code points.
    •  
  • y — sticky. Matches only at lastIndex.
    •  
 
JavaScript regex quirks to know
 
     
  • 
Backslashes need escaping in some inputs. Here, you can type them as-is
    (\d, not \\d) — what you see is what gets compiled.

    •  
  • 
Named groups use (?<name>…). They appear in the
groups object on each match.

    •  
  • 
Lookbehind ((?<=…), (?<!…)) is supported
    in all modern browsers (ES2018+).

    •  
 
Is my data private?
 

Yes. Pattern compilation and matching happen entirely in your browser via
  the built-in RegExp. Nothing leaves your device.