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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.
Rex is a regularexpression library which implements most of the POSIX 1003.2 specification. It is very mature and has been in heavy production use by thousands of users, on many platforms, since 2002.
Txt2XMLParser is a versatile and generic text to xml converter library. Based on RegularExpression it can be configured using a single xml file allowing to parse any txt file format (csv , generic txt files, protocol formats such as SIP)
PET is a C++ library that implements generic regular path expressions. It provides a set of classes and overloaded operators that allow the programmer to define regular path expressions over user-defined data structures using solely the GCC compiler
Manages Java application/tool options. Options are mapped to Java Bean properties using annotations. Options can be loaded from command line arg String[] array, an XML file, or a java properties file. Help texts can be generated.
Provides a Java programmable only text file editor. No gui is available. It supplies most of the features you expect from an editor including selections.