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flex is a tool for generating scanners: programs which
recognized lexical patterns in text. flex reads the given
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 as output a C
source file, ‘lex.yy.c’, which defines a routine ‘yylex()’.
This file is compiled and linked with the ‘-lfl’ library to
produce an executable. When the executable is run, it
analyzes its input for occurrences of the regular
expressions. Whenever it finds one, it executes the
corresponding C code.
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