Regex

Learn Java regular expressions with a live tester.

Match patterns, inspect highlighted results, and understand the building blocks without opening another site.

Interactive regex tester

Enter a Java regex pattern, test it against a sample string, and inspect every match.

Regex pattern

Test string

Highlighted result

Java is a programming language. JavaScript is not Java.

Matches found

Match 1 at index 0: Java

Match 2 at index 50: Java

Pattern explanation

\bJava\b