Regular Expression Libraries

Oro

Linear time regular expressions for Java

Jakarta RegExp

RegExp

Generex A Java Library for regex to Strings generation

Java port of Oniguruma: http://www.geocities.jp/kosako3/oniguruma that uses byte arrays directly instead of java Strings and chars

Named capturing groups for Java 5/6

A regular expression library for Java

GNU RegExp

Library to search/match/tokenize using many regular expression all at once with greater performance.