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Test and debug regular expressions with real-time matching and highlighting
100% Private - Files Processed Locally
Your files never leave your device
Regular expressions (regex) are patterns for matching, searching, and manipulating text. This tester lets you build and debug patterns in real-time with syntax highlighting and match details.
Features include: syntax highlighting of matches, support for capture groups, all standard regex flags, common pattern library, and instant feedback as you type.
Regular expressions are sequences of characters that define search patterns. They're used in programming for text validation, parsing, and transformation. Common uses include email validation, phone number extraction, and data cleaning.
Global (g): Find all occurrences. Case insensitive (i): Ignore letter case. Multiline (m): Match start/end of each line. DotAll (s): Dot matches newline characters. Unicode (u): Enable full Unicode matching.
Use parentheses () in your pattern to create capture groups. Groups are numbered from left to right starting at $1. You can access matched group content in the match details panel.
No! All processing happens locally in your browser. Your regex patterns and test strings never leave your device, ensuring complete privacy.
//gEnter a regex pattern above to start testing
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