lfs-book-zh_CN/appendixa/flex-desc.xml

<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>

<sect2><title>Descriptions</title>

<para>(Last checked against version &flex-contversion;.)</para>

<sect3><title>Program file descriptions</title>

<para><command>flex</command> is a tool for generating programs that
recognize 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 for
those patterns. The reason to use flex is that it is much easier to specify
the rules for than to write the actual pattern-finding program.</para>

<para><command>flex++</command> invokes a version of flex that is used
exclusively for C++ scanners.</para>

</sect3>

<sect3><title>Library file descriptions</title>

<para><command>libfl</command> is the flex library.</para>

</sect3>

</sect2>