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+.TH LEX 1
+.CT 1 prog_other
+.SH NAME
+lex \(mi generator of lexical analysis programs
+.SH SYNOPSIS
+.B lex
+[
+.B -tvfn
+]
+[
+.I file ...
+]
+.SH DESCRIPTION
+.I Lex
+generates programs to be used in simple lexical analysis of text.
+The input
+.I files
+(standard input default)
+contain regular expressions
+to be searched for, and actions written in C to be executed when
+expressions are found.
+.PP
+A C source program,
+.F lex.yy.c
+is generated, to be compiled thus:
+.IP
+.B cc lex.yy.c -ll
+.LP
+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.
+.PP
+The options have the following meanings.
+.TP
+.B -t
+Place the result on the standard output instead of in file
+.FR lex.yy.c .
+.TP
+.B -v
+Print a one-line summary of statistics of the generated analyzer.
+.TP
+.B -n
+Opposite of
+.BR -v ;
+.B -n
+is default.
+.TP
+.B -f
+`Faster' compilation: don't bother to pack
+the resulting tables; limited to small programs.
+.SH EXAMPLES
+This program converts upper case to lower,
+removes blanks at the end of lines,
+and replaces multiple blanks by single blanks.
+.PP
+.EX
+%%
+[A-Z]	putchar(yytext[0]+\'a\'-\'A\');
+[ ]+$
+[ ]+	putchar(\' \');
+.EE
+.SH FILES
+.F lex.yy.c
+.SH "SEE ALSO"
+.IR yacc (1), 
+.IR sed (1)
+.br
+M. E. Lesk and E. Schmidt,
+`LEX\(emLexical Analyzer Generator', 
+this manual, Volume 2