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+Flex is a tool for generating scanners. A scanner, sometimes called a
+tokenizer, is a program which recognizes lexical patterns in text. The
+flex program reads user-specified input files, or its standard input
+if no file names are given, for a description of a scanner to generate.
+The description is in the form of pairs of regular expressions and C
+code, called rules. Flex generates a C source file named, "lex.yy.c",
+which defines the function yylex(). The file "lex.yy.c" can be compiled
+and linked to produce an executable. When the executable is run, it
+analyzes its input for occurrences of text matching the regular
+expressions for each rule. Whenever it finds a match, it executes the
+corresponding C code.
+
+WWW: http://flex.sourceforge.net/