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Unix Version 7 - man page for lex (v7 section 1)

LEX(1)				     General Commands Manual				   LEX(1)

NAME
       lex - generator of lexical analysis programs

SYNOPSIS
       lex [ -tvfn ] [ file ] ...

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 writ-
       ten 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 exe-
       cutes the associated C action for each regular expression that is recognized.

       The following lex program converts upper case to lower,	removes  blanks  at  the  end  of
       lines, and replaces multiple blanks by single blanks.

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

       The options have the following meanings.

       -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.

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

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

SEE ALSO
       yacc(1)
       M. E. Lesk and E. Schmidt, LEX - Lexical Analyzer Generator

											   LEX(1)


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