Regex Tester
Test a regular expression against text and inspect matches.
Use JavaScript regular expression flags such as g, i, m, s, u, or y.
Matches
Run a tool to see output.
Enter a pattern and flags, paste test text, and review match indexes, captured groups, and named groups. The matcher guards against zero-length match loops.
How to Use
Enter a pattern and flags, paste test text, and review match indexes, captured groups, and named groups. The matcher guards against zero-length match loops.
- Open the tool : Start with Regex Tester, then follow the steps below.
- Set the inputs : Adjust the fields to match the values you want to process.
- Run and copy : Use the action buttons, then copy or share the result if you need it elsewhere.
Common Questions
What does Regex Tester help inspect or debug?
Test a regular expression against text and inspect matches.
Can I copy or export the result from Regex Tester?
Yes. Use the copy button or any download option that appears after the result is generated.
What is a regular expression (regex)?
A regular expression is a specific sequence of characters that forms a search pattern. Developers use these patterns in code to quickly find, validate, or replace specific pieces of text, such as ensuring an input field contains a properly formatted email address.