| <sect2><title>Short descriptions</title><para><command>flex</command> is a tool for generating programs thatrecognize patterns in text. Pattern recognition is useful in many applications.From a set of rules on what to look for flex makes a program that looks forthose patterns. The reason to use flex is that it is much easier to specifythe rules for than to write the actual pattern-finding program.</para><para><command>flex++</command> invokes a version of flex that is usedexclusively for C++ scanners.</para><para><command>libfl.a</command> is the flex library.</para></sect2>
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