Free · Live · Nothing uploaded

Regex tester

Build and debug regular expressions with live match highlighting, capture groups, flags and a replace preview. JavaScript flavor, right in your browser.

/ /
Result


          

        

        
🔒 Patterns and test text never leave your browser.

      

    


    


    

      

        
Quick reference

        

          
\d digit · \w word · \s space

          
. any · ^ start · $ end

          
* 0+ · + 1+ · ? 0/1 · {2,5} range

          
[abc] set · [^a] not · (a|b) or

          
(...) group · (?<n>...) named · (?:...) non-capturing

          
\b word boundary · \\ escape

        

      

    


    


    

      

        
Regex tester FAQ

        
What regex flavor is this?
JavaScript (ECMAScript), with flags g, i, m, s, u and y — exactly what runs in browsers and Node.js.

        
Does it show capture groups?
Yes — each match lists its numbered and named groups with positions, and matches highlight live.

        
Is my text private?
Completely — everything runs in your browser; nothing is uploaded.