LEX(1)                  COMMAND REFERENCE                  LEX(1)



NAME
     lex - generator of lexical analysis programs

SYNOPSIS
     lex [ -tvfn ] [ filename ] ...

DESCRIPTION
     Lex generates programs to be used in simple lexical analyis
     of text.  The input files (standard input default) contain
     regular expressions to be searched for, and actions written
     in C to be executed when expressions are found.

     A C source program, 'lex.yy.c' is generated, to be compiled
     thus:

          cc lex.yy.c -ll

     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.

     Refer to the section on lex in the UTek Tools manual, Volume
     2.

OPTIONS
     -f   "Faster" compilation: don't bother to pack the
          resulting tables; limited to small programs.

     -n   Opposite of -v; -n is default.

     -t   Place the result on the standard output instead of in
          file lex.yy.c.

     -v   Print a one-line summary of statistics of the generated
          analyzer.

EXAMPLES
          lex lexcommands

     would draw lex instructions from the file lexcommands, and
     place the output in lex.yy.c


          %%
          [A-Z] putchar(yytext[0]+'a'-'A');
          [ ]+$
          [ ]+ putchar(' ');

     is an example of a lex program that would be put into a lex
     command file.  This program converts upper case to lower,
     removes blanks at the end of lines, and replaces multiple
     blanks by single blanks.



Printed 10/17/86                                                1

LEX(1)                  COMMAND REFERENCE                  LEX(1)



SEE ALSO
     yacc(1), sed(1).





















































Printed 10/17/86                                                2

%%index%%
na:72,80;
sy:152,158;
de:310,771;
op:1081,466;
ex:1547,596;
se:2287,141;
%%index%%000000000106