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Developer tool

Regex Tester - Regular Expression Tool

Enter a pattern and test text; matches are highlighted and capture groups are listed below.

RegexChoose pattern and flags
Result0 matches

        

    




    
    

        

            
Quick guide

            
How to use the Regex tester

            
Regex is powerful for finding text patterns, but one wrong character can change the result. The tester lets you see pattern and flag changes instantly.

        


        

            

                
How to use it

                
    
                    
  1. Write the regular expression in the pattern field.
    2. 
                    
  2. Choose flags like global, ignore case and multiline.
    3. 
                    
  3. Review matches and groups in the result area.
    4. 
                

            

            

                
Common uses

                
    
                    
  • Finding emails and phone numbers
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  • Log analysis
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  • Preparing text cleanup rules
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FAQ

                

                    Can regex cause performance issues?
                    
Very complex patterns can slow down on large text.

                

                

                    What do flags do?
                    
They control behavior such as finding all matches, ignoring case or working line by line.