32v 1m lex
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LEX(1) UNIX Programmer's Manual LEX(1)
lex - generator of lexical analysis programs
lex [ -tvfn ] [ file ] ...
_L_e_x generates programs to be used in simple lexical analyis of text. The input _f_i_l_e_s (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.
The following _l_e_x program converts upper case to lower, removes blanks at the end of lines, and replaces multiple blanks by single blanks.
%% [A-Z] putchar(yytext+'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 result- ing tables; limited to small programs.
yacc(1) M. E. Lesk and E. Schmidt, _L_E_X - _L_e_x_i_c_a_l _A_n_a_l_y_z_e_r _G_e_n_e_r_a_t_o_r