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FLEX(1)				  Programming			       FLEX(1)

NAME
       flex - the fast lexical analyser	generator

SYNOPSIS
       flex [OPTIONS] [FILE]...

DESCRIPTION
       Generates programs that perform pattern-matching	on text.

   Table Compression:
       -Ca, --align
	      trade off	larger tables for better memory	alignment

       -Ce, --ecs
	      construct	equivalence classes

       -Cf    do not compress tables; use -f representation

       -CF    do not compress tables; use -F representation

       -Cm, --meta-ecs
	      construct	meta-equivalence classes

       -Cr, --read
	      use read() instead of stdio for scanner input

       -f, --full
	      generate fast, large scanner. Same as -Cfr

       -F, --fast
	      use alternate table representation. Same as -CFr

       -Cem   default compression (same	as --ecs --meta-ecs)

   Debugging:
       -d, --debug
	      enable debug mode	in scanner

       -b, --backup
	      write backing-up information to lex.backup

       -p, --perf-report
	      write performance	report to stderr

       -s, --nodefault
	      suppress default rule to ECHO unmatched text

       -T, --trace
	      flex should run in trace mode

       -w, --nowarn
	      do not generate warnings

       -v, --verbose
	      write summary of scanner statistics to stdout

       --hex  use hexadecimal numbers instead of octal in debug	outputs

FILES
       -o, --outfile=FILE
	      specify output filename

       -S, --skel=FILE
	      specify skeleton file

       -t, --stdout
	      write scanner on stdout instead of lex.yy.c

       --yyclass=NAME
	      name of C++ class

       --header-file=FILE
	      create a C header	file in	addition to the	scanner

       --tables-file[=FILE] write tables to FILE

   Scanner behavior:
       -7, --7bit
	      generate 7-bit scanner

       -8, --8bit
	      generate 8-bit scanner

       -B, --batch
	      generate batch scanner (opposite of -I)

       -i, --case-insensitive
	      ignore case in patterns

       -l, --lex-compat
	      maximal compatibility with original lex

       -X, --posix-compat
	      maximal compatibility with POSIX lex

       -I, --interactive
	      generate interactive scanner (opposite of	-B)

       --yylineno
	      track line count in yylineno

   Generated code:
       -+,  --c++
	      generate C++ scanner class

       -Dmacro[=defn]
	      #define macro defn  (default defn	is '1')

       -L,  --noline
	      suppress #line directives	in scanner

       -P,  --prefix=STRING
	      use STRING as prefix instead of "yy"

       -R,  --reentrant
	      generate a reentrant C scanner

       --bison-bridge
	      scanner for bison	pure parser.

       --bison-locations
	      include yylloc support.

       --stdinit
	      initialize yyin/yyout to stdin/stdout

       --nounistd
	      do not include <unistd.h>

       --noFUNCTION
	      do not generate a	particular FUNCTION

   Miscellaneous:
       -c     do-nothing POSIX option

       -n     do-nothing POSIX option

       -?

       -h, --help
	      produce this help	message

       -V, --version
	      report flex version

SEE ALSO
       The  full documentation for flex	is maintained as a Texinfo manual.  If
       the info	and flex programs are properly installed  at  your  site,  the
       command

	      info flex

       should give you access to the complete manual.

The Flex Project		   May 2017			       FLEX(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=flex&sektion=1&manpath=FreeBSD+Ports+14.3.quarterly>

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