https://gunkies.org/index.php?action=history&feed=atom&title=32v_1m_lex 2026-05-12T10:06:50Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=32v_1m_lex&diff=6978&oldid=prev 2009-10-26T14:31:50Z

<p>New page: LEX(1) UNIX Programmer&#039;s Manual LEX(1) == NAME == lex - generator of lexical analysis programs == SYNOPSIS == lex [ -tvfn ] [ file ] ... == DESCRI...</p> <p><b>New page</b></p><div>LEX(1) UNIX Programmer's Manual LEX(1)<br /> <br /> <br /> <br /> == NAME ==<br /> lex - generator of lexical analysis programs<br /> <br /> == SYNOPSIS ==<br /> lex [ -tvfn ] [ file ] ...<br /> <br /> == DESCRIPTION ==<br /> _L_e_x generates programs to be used in simple lexical analyis<br /> of text. The input _f_i_l_e_s (standard input default) contain<br /> regular expressions to be searched for, and actions written<br /> in C to be executed when expressions are found.<br /> <br /> A C source program, `lex.yy.c' is generated, to be compiled<br /> thus:<br /> <br /> cc lex.yy.c -ll<br /> <br /> This program, when run, copies unrecognized portions of the<br /> input to the output, and executes the associated C action<br /> for each regular expression that is recognized.<br /> <br /> The following _l_e_x program converts upper case to lower,<br /> removes blanks at the end of lines, and replaces multiple<br /> blanks by single blanks.<br /> <br /> <br /> %%<br /> [A-Z] putchar(yytext[0]+'a'-'A');<br /> [ ]+$<br /> [ ]+ putchar(' ');<br /> <br /> The options have the following meanings.<br /> <br /> -t Place the result on the standard output instead of in<br /> file `lex.yy.c'.<br /> <br /> -v Print a one-line summary of statistics of the generated<br /> analyzer.<br /> <br /> -n Opposite of -v; -n is default.<br /> <br /> -f `Faster' compilation: don't bother to pack the result-<br /> ing tables; limited to small programs.<br /> <br /> == SEE ALSO ==<br /> [[32v 1m yacc|yacc(1)]]<br /> 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<br /> <br /> [[Category:32v man section 1]]</div>

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