Regex Tools

Online Regex Tool

Online Regex Tool runs a JavaScript regular expression against your text in the browser, with live match highlighting, a count, and capture groups.

Client-sideRuns entirely in your browser — your data never leaves your device.

Online Regex Tool is a free Regex Tools utility that runs entirely in your browser — nothing you enter is uploaded.

Test text
Matches




Cheat sheet — common tokens
\d
digit 0-9
\w
word char (A-Za-z0-9_)
\s
whitespace
\b
word boundary
.
any character
[abc]
one of a, b, c
[^abc]
not a, b, or c
a|b
a or b
a*
zero or more a
a+
one or more a
a?
optional a
a{2,4}
2 to 4 of a
^ $
start / end
(...)
capture group
(?:...)
non-capture group



  
How to use Online Regex Tool

  
    
      
  1. Paste the pattern and test string you need to process into the input box.
    2. 
      
  2. Adjust the Pattern, Flags options to match what you need.
    3. 
      
  3. The result is computed live in your browser as you edit the input.
    4. 
      
  4. Use Copy matches to keep or reuse the result.
    5. 
  

  
About this tool

  
Online Regex Tool is a static, client-side tool with no backend. Online Regex Tool runs your pattern locally with the JavaScript engine and shows captures live.

  
Your pattern and test text stay on your device. No data is sent anywhere, so it stays fast and private by default.

  
Frequently asked questions

  

      
What does Online Regex Tool do?
Online Regex Tool lets you process your input right in the browser using the Pattern, Flags controls, with the result shown instantly and nothing uploaded.

      
Is Online Regex Tool free to use?
Yes — Online Regex Tool is completely free, with no usage limits.

      
Is my input private in Online Regex Tool?
Yes — your input never leaves your device; Online Regex Tool does all the work in your browser.

      
Which regex flavor does Online Regex Tool use?
Online Regex Tool runs your pattern with the browser's own JavaScript regex engine, live and on your device.

      
Does Online Regex Tool work offline?
Once the page has loaded, Online Regex Tool keeps working with no network connection.

  

  
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