Complete your introduction to the Regex API, then find out how regular expressions make quicker work of common tasks like code documentation and lexical analysis.

The regex specifies two capturing groups: number 1 is (Java( language)2), which matches Java language language, and number 2 is ( language), which matches a space character followed by language.

Our regular expression thus matches a word, followed by one or more whitespace characters, followed by a second instance of the word. The trailing word boundary sequence (\) is necessary to prevent ...

String manipulation is always resource-intensive, but compiled regex in Python and Java can help keep performance issues at bay.