Regular Expression Tester

Write, test, and debug your JavaScript regular expressions in real-time. See matches and capture groups as you type.

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              About The Regular Expression Tester
            

            

              A Regular Expression (or Regex) is a sequence of characters that
              specifies a search pattern in text. This tool allows you to test
              your JavaScript-compatible regular expressions against a sample
              text, providing instant visual feedback by highlighting all
              matches and listing the captured groups.
            


            
Common Flags

            
    
              
  • 
                g (Global): Finds all matches instead of stopping
                after the first one.
              
    • 
              
  • 
                i (Case-Insensitive): Makes the expression
                case-insensitive (e.g., /a/i would match "a" and "A").
              
    • 
              
  • 
                m (Multiline): Allows start (^) and
                end ($) anchors to match at the beginning and end
                of each line, not just the whole string.
              
    • 
              
  • 
                s (Dot All): Allows the dot (.) to
                match newline characters as well.
              
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How to Use This Tool:

            
    
              
  1. 
                Enter Your Regex: Type your regular expression
                pattern in the input field between the slashes
                /.../.
              
    2. 
              
  2. 
                Select Flags: Check the boxes for any flags
                (like global or case-insensitive) you want to apply.
              
    3. 
              
  3. 
                Provide Test String: Paste or type the text you
                want to test your expression against in the larger text area.
              
    4. 
              
  4. 
                See Instant Results: As you type, the tool will
                automatically:
                
      
                  
    • Highlight all matching parts of your test string.
      • 
                  
    • 
                    List all the matches and their capture groups in the panel
                    below.
                  
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    5. 
              
  5. 
                Debug: If your expression is invalid, an error
                message will appear in the results panel.
              
    6.