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Fastest string utility is java library (JAR ) for string operation . This library is very easy to use, very fast and very efficient in string operations such as split, toUpperCase, toLowerCase, replace, delete, regularexpression and others.
Multi-platform regularexpression (regex) creation. Highlights regex matches, and regex groups for quick regularexpression creation. Save/load regularexpression sessions. Create robust regex patterns on any major platform. Supports PCRE and wxRegEx.
The treexpr library is a Free Software library that applies regularexpression concepts to tree structures. It it written in C and has a JNI binding to Java.