Regex Tester
Test and debug regular expressions with real-time matching, highlighting, and capture group support.
Results
0 matchesWhat are Regular Expressions?
Regular expressions (regex) are powerful pattern-matching sequences used to search, match, and manipulate text. They are supported in virtually every programming language โ JavaScript, Python, Java, Go, Rust, and more. Developers use regex for input validation (emails, phone numbers, URLs), text parsing and extraction, find-and-replace operations, log analysis, and data cleaning. While regex syntax can seem cryptic at first, mastering common patterns dramatically improves your text-processing productivity.
How to Use This Regex Tester
Type your regular expression pattern in the top input field. Toggle flags (g, i, m, s) to change matching behavior.
Enter or paste your test string in the text area below. Matches are highlighted in real-time as you type.
View capture groups, match indices, and detailed match information in the results panel below.