How to Test a Regular Expression
Step-by-step guide to writing, testing, and debugging regular expressions using the DevHexLab Regex Tester.
Tool Used
Regex Tester
1
Open the Regex Tester
Navigate to /tools/text/regex-tester.
2
Enter the regex pattern
Type your regular expression into the pattern field. You can set flags such as case-insensitive (i), global (g), and multiline (m).
3
Paste the test string
Enter the text you want to test against in the test string area. Matches are highlighted in real time as you type.
4
Review match details
The tool shows every match, the capture group values, and the index positions of each match. Use this to refine your pattern until it captures exactly what you need.
All done!
You are ready to use Regex Tester like a pro.