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<tr><td width=20><td><b>LEX(1)</b><td align=right><b>LEX(1)</b>
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<p><font size=+1><b>NAME </b></font><br>
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lex – generator of lexical analysis programs<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>lex</font></tt> [ <tt><font size=+1>−tvn9</font></tt> ] [ <i>file ...</i> ]<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Lex</i> generates programs to be used in simple lexical analysis of
text. The input <i>files</i> (standard input default) contain regular
expressions to be searched for and actions written in C to be
executed when expressions are found.
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A C source program, <tt><font size=+1>lex.yy.c</font></tt> is generated. This program, when
run, copies unrecognized portions of the input to the output,
and executes the associated C action for each regular expression
that is recognized.
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The options have the following meanings.<br>
<tt><font size=+1>−t</font></tt> Place the result on the standard output instead of in file <tt><font size=+1>lex.yy.c</font></tt>.<br>
<tt><font size=+1>−v</font></tt> Print a one-line summary of statistics of the generated analyzer.<br>
<tt><font size=+1>−n</font></tt> Opposite of <tt><font size=+1>−v</font></tt>; <tt><font size=+1>−n</font></tt> is default.<br>
<tt><font size=+1>−9</font></tt> Adds code to be able to compile through the native C compilers.<br>
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<p><font size=+1><b>EXAMPLES </b></font><br>
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This program converts upper case to lower, removes blanks at the
end of lines, and replaces multiple blanks by single blanks.
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<tt><font size=+1>%%<br>
[A−Z] putchar(yytext[0]+'a'−'A');<br>
[ ]+$<br>
[ ]+ putchar(' ');<br>
</font></tt>
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<p><font size=+1><b>FILES </b></font><br>
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<tt><font size=+1>lex.yy.c</font></tt> output<br>
<tt><font size=+1>/sys/lib/lex/ncform</font></tt> template<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man1/yacc.html"><i>yacc</i>(1)</a>, <a href="../man1/sed.html"><i>sed</i>(1)</a><br>
M. E. Lesk and E. Schmidt, ‘LEX--Lexical Analyzer Generator’, <i>Unix
Research System Programmer’s Manual,</i> Tenth Edition, Volume 2.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/cmd/lex<br>
</font></tt>
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<p><font size=+1><b>BUGS </b></font><br>
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Cannot handle UTF.
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The asteroid to kill this dinosaur is still in orbit.<br>
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<!-- TRAILER -->
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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<!-- TRAILER -->
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