Regex Tester
Test your regular expressions against a string with real-time match highlighting and detailed results. Fast, private, and runs entirely in your browser.
\dDigit\wWord character\sWhitespace[a-z]Lowercase letter[A-Z]Uppercase letter^patternStart of stringpattern$End of string*0 or more+1 or more?0 or 1.Any character(group)Capture group(?:group)Non-capturing group\/Escape characterWhat is a Regular Expression?
A regular expression (often shortened to regex or regexp) is a sequence of characters that specifies a search pattern in text. It's a powerful tool used in programming and text editing to find, replace, and validate strings. Regex patterns can range from simple character matches to complex patterns involving various operators, quantifiers, and groupings.
When to Use a Regex Tester
A regex tester is an essential utility for developers, data analysts, and anyone working with text data. It provides a sandbox to build, debug, and refine regular expressions before implementing them in code. Use a tester to validate form inputs (like emails or phone numbers), parse log files, scrape data from websites, or perform complex find-and-replace operations in your editor. This tool helps you see exactly what your pattern is matching in real-time, saving you from frustrating trial-and-error in your application.