Regex Tester
Regex tester. Enter a regular expression pattern and test string, select a flavor (PHP, JavaScript, Python, Java, .NET, Ruby, etc.), and check match results in real time. Match results include detailed information such as matched parts, capture groups, and match positions. All processing is performed locally in the browser, with no dependency on external APIs.
Flags
How to use
About this tool
Input a regular expression pattern and test string, select a flavor (PHP, JavaScript, Python, Java, .NET, Ruby, etc.), and check match results in real time. Match results include detailed information such as matched parts, capture groups, and match positions. All processing is performed locally in the browser, with no dependency on external APIs.
How to use
Enter a regular expression pattern and test string; match results are displayed in real time. Select a flavor to compute match results based on that flavor's regex syntax. Set flags (global, case insensitive, multiline, dot all) to control match behavior.
Use cases
• Verify and debug regular expression patterns • Check regex syntax differences across flavors • Verify capture group behavior • Learn and understand regular expressions • Validate regex patterns during code review
How it works
Uses JavaScript's RegExp API to compute match results. Differences between flavors (PHP, JavaScript, Python, Java, .NET, Ruby) are handled through flag mapping and error handling. Match results include detailed information such as matched parts, capture groups, and match positions. All processing is done in the browser; no dependency on external APIs.
Privacy and data
All processing is done entirely in the browser; regular expression patterns and test strings are never sent to any server. Input data is handled only in memory and is not saved.