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 special character \d will match any digit 0-9 whereas the special character \D does the inverse and will match any character except a digit. Let's return to our Regex 101 tool and enter the ...

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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 ...

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.

+matches (regex: String): boolean Returns true if this string matches the pattern. +replaceAll (regex: String, replacement: String): String Returns a new string that replaces all matching substrings ...

However, for some time now, in fact since Java version 1.4, there has been a regular expression package within the stand Java libraries. That is, the Java package, java.util.regex.