Patterns is the ultimate tool for working with regular expressions. Build great patterns quickly and effortlessly with regex syntax highlighting, live match view, replace mode, built-in quick reference, and much more. Whether you're a seasoned regex wizard or new to regex, Patterns is the only tool you'll ever need.


  • Regular expression syntax highlighting makes it easy to see how your pattern is interpreted by the regex engine. No more confusion about what needs to be escaped.
  • The Matches view lets you inspect all matches and captured text produced by your regex, alongside your search text. Clicking on a match or group highlights both the matched search text and the specific portion of your regex that produced the match or capture.
  • See matches, replacements, and filter results in real time while you edit your pattern.
  • Use the Copy Code feature to quickly export your pattern for use in a number of different programming languages.
  • The built-in regular expression quick reference sheet helps you learn and expand your knowledge of regex syntax.
  • Customize the regex engine for different regex "flavors". Supported flavors are: Oniguruma, POSIX Basic (BRE), POSIX Extended (ERE), Perl (PCRE), emacs, Java, Ruby, bash, grep, and sed.
  • If you have a syntax error in your pattern, a helpful error message lets you know the exact nature of the error.