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.
JFEP is a Java fast mathematical expressionparser and evaluator. It is designed to avoid inefficiency and to support multiple evaluations without overhead.
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.