Regex Tester
Test, debug, and learn regular expressions with real-time pattern matching and highlighting
Real-time Testing
Instantly test your patterns against text with immediate feedback
Match Highlighting
See all matches highlighted directly in your test string
Find & Replace
Test search and replace operations with capture group support
Frequently Asked Questions
Find answers to common questions about using this tool.
A regex tester allows you to write and test regular expression patterns against sample text in real-time. It highlights matches instantly, helping you debug and perfect your patterns before using them in code.
Yes, matches are highlighted immediately as you type your pattern. You can see all matches, capture groups, and their positions in the test string without needing to run any code.
The tester uses JavaScript regex engine which supports standard regex syntax including character classes, quantifiers, lookaheads, lookbehinds, named groups, and Unicode property escapes.
Yes, you can toggle common regex flags including global (g), case-insensitive (i), multiline (m), dotAll (s), and unicode (u) to modify how your pattern matches against the test text.
The tool provides visual feedback by highlighting matches and groups with distinct colors. This visual approach helps you understand how each part of your regex pattern contributes to the overall match.