RegexLab Pro
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PCRE (emulated)
Python (emulated)
Go / RE2 (emulated)
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Enter a regex above to see a token-by-token explanation.
Copy
Enter a regex to generate code.
Run Test
Click "Run Test" to measure performance. Uses a Web Worker so the UI stays responsive.
Pattern 2 (compare against current pattern):
Each line of the test string will be shown with which pattern(s) match it.
Suggest
Paste examples and click Suggest to get candidate regexes.