...
| Library | Algorithm | POSIX longest leftmost match | License | URL |
| java.util.regex | Backtracking | No | Java | (included as part of Java) |
| Jakarta ORO | Backtracking | No | Apache | http://jakartaattic.apache.org/oro/projects/jakarta-oro.html |
| Jakarta Regex | Backtracking | No | Apache | http://jakartaattic.apache.org/regexp/projects/jakarta-regexp.html |
| com.stevesoft.pat | Backtracking | Unknown | LGPL | http://www.javaregex.com/home.html |
| dk.brics.automaton | DFA | Unknown | BSD | http://www.brics.dk/automaton/index.html |
| JRegex | Backtracking | Unknown | BSD | http://jregex.sourceforge.net/ |
...