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Co�tmeur's other contribution to the CUG Library is the Flex++ package. Like Bison++, Flex++ retains downward compatability with existing C programs while offering the benefits of C++ classes. Coetmeur's Flex++ is derived directly from GNU Flex ("Fast LEX"), the popular replacement for the Unix utility called LEX. Since its introduction two decades ago, the LEX software interface remains very popular for developing front-end lexical analyzers for YACC and standalone text processing applications. A LEX solution is ideal for matching both simple and complex patterns of characters. 1/3