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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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