Provided by: rgxg_0.1.2-5_amd64 bug

NAME

       rgxg - ReGular eXpression Generator

SYNOPSIS

       rgxg COMMAND [ARGS]

DESCRIPTION

       rgxg is a generator for (extended) regular expressions.

       For  instance  it  is  useful  to generate a regular expression to exactly match a numeric
       range or all addresses of a given CIDR block.

COMMANDS

       alternation [options] [PATTERN...]

           Generate a regular expression that matches any of the given patterns.

           Options

              -N     Omit the outer parentheses, if any, of the regular expression.  This  option
                     can  be  useful  if  the generated regular expression is used within another
                     alternation.

              -h     Display help and exit.

           Examples

              Match either lion, elephant, rhino, buffalo or leopard:
                 $ rgxg alternation lion elephant rhino buffalo leopard
                 (lion|elephant|rhino|buffalo|leopard)

       cidr [options] CIDR

           Generate a regular expression that matches all addresses of the given CIDR block. Both
           IPv4 and IPv6 CIDR blocks are supported.

           Options

              -N     Omit  the  outer parentheses, if any, of the regular expression. This option
                     can be useful if the generated regular expression  is  used  within  another
                     alternation.

              -l     Match only IPv6 addresses with lower case letters. By default both lower and
                     upper case letters are matched.

              -U     Match only IPv6 addresses with upper case letters. By default both lower and
                     upper case letters are matched.

              -u     Do  not  match  IPv6  addresses  with  zero compression (second form of text
                     representation of IPv6 addresses mentioned in section 2.2 of RFC 4291).

              -s     Do  not  match  IPv6  addresses  in  mixed  notation  (third  form  of  text
                     representation of IPv6 addresses mentioned in section 2.2 of RFC 4291).

              -h     Display help and exit.

           Examples

              Match 192.168.0.0/24:
                 $ rgxg cidr 192.168.0.0/24
                 192.168.0.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])

              Match 2001:db8:aaaa:bbbb:cccc:dddd::/96 limited to lower case letters:
                 $ rgxg cidr -l 2001:db8:aaaa:bbbb:cccc:dddd::/112
                 2001:0?db8:aaaa:bbbb:cccc:dddd((::[0-9a-f]{1,4}|::|:0?0?0?0(::|:[0-9a-f]{1,4}))|:0.0(.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){2})

              Match 2001:db8:1234::/48 restricted to uncompressed standard notation:
                 $ rgxg cidr -u -s 2001:db8:1234::/48
                 2001:0?[Dd][Bb]8:1234(:[0-9A-Fa-f]{1,4}){5}

       escape [options] STRING

           Generate  the regular expression which matches the given string by escaping the escape
           characters.

           Options

              -h     Display help and exit.

           Examples

              Match '1+(2*(3-4))':
                 $ rgxg escape 1+(2*(3-4))
                 1\+\(2\*\(3-4\)\)

       help [COMMAND]

           Describe the usage of rgxg or the given COMMAND.

       range [options] FIRST [LAST]

           Generate a regular expression that matches the number range between FIRST and LAST. If
           LAST  is  omitted the regular expression matches all numbers which are greater than or
           equal FIRST. The numbers must be positive and given in base-10 notation.

           Options

              -b BASE
                     Generate the regular expression for the number range  with  base  BASE.  The
                     BASE must be in the range between 2 and 32. The default base is 10.

              -N     Omit  the  outer parentheses, if any, of the regular expression. This option
                     can be useful if the generated regular expression  is  used  within  another
                     alternation.

              -l     For  bases  greater  than  10 only match lower case letters. By default both
                     lower and upper case letters are matched.

              -U     For bases greater than 10 only match upper case  letters.  By  default  both
                     lower and upper case letters are matched.

              -h     Display help and exit.

              -z     Only  match  numbers  with  leading  zeros. By default the number of leading
                     zeros depends on the length (i.e. the number of digits) of  LAST  (see  also
                     -m). The default is to not match numbers with leading zeros.

              -Z     Match  numbers  with  a  variable  number  of  leading zeros. By default the
                     maximum number of leading zeros depends on the length (i.e.  the  number  of
                     digits)  of  LAST  (see  also  -m). The default is to not match numbers with
                     leading zeros.

              -m LENGTH
                     with -z or -Z, the minimum LENGTH  of  matched  numbers.  For  instance  the
                     number  5  with  LENGTH  set  to 3 and -z option set is matched as '005'. If
                     LENGTH is lesser than or equal to the number of digits of LAST, this  option
                     has no effect.

           Examples

              Match the numbers from 0 to 31:
                 $ rgxg range 0 31
                 (3[01]|[12]?[0-9])

              Match numbers from 0 to 31 with base 2:
                 $ rgxg range -b 2 0 31
                 (1[01]{0,4}|0)

              Match 0 to 31 with base 16:
                 $ rgxg range -b 16 0 31
                 1?[0-9A-Fa-f]

              Match 0 to 31 with base 16 limited to upper case letters:
                 $ rgxg range -b 16 -U 0 31
                 1?[0-9A-F]

              Match 0 to 31 with base 16 limited to lower case letters:
                 $ rgxg range -b 16 -l 0 31
                 1?[0-9a-f]

              Match 00 to 31:
                 $ rgxg range -z 0 31
                 (3[01]|[0-2][0-9])

              Match 0000 to 0031:
                 $ rgxg range -z -m 4 0 31
                 (003[01]|00[0-2][0-9])

              Match 0 to 31 and 00 to 31 and 000 to 031:
                 $ rgxg range -Z -m 3 0 31
                 (0?3[01]|0?[0-2]?[0-9])

              Match 0 to 31 and omit outer parentheses:
                 $ rgxg range -N 0 31
                 3[01]|[12]?[0-9]

              Match all numbers greater than or equal to 4096:
                 $ rgxg range 4096
                 ([1-9][0-9]{4,}|[5-9][0-9]{3}|4[1-9][0-9]{2}|409[6-9])

       version
           Prints the version of the rgxg command.

EXIT STATUS

       The  exit  status  is  0  if the regular expression has been successfully generated. If an
       error occurred the exit status is 1.

NOTES

       The regular expressions generated by rgxg are supposed to be used in any context. This may
       lead to some side effects.

       For instance consider the following:

          $ echo '192.168.0.999' | grep -E "$(rgxg cidr 192.168.0.0/24)"
          192.168.0.999
          $

       This   is   correct   because   the   regular   expression  for  '192.168.0.0/24'  matches
       '192.168.0.99'.

       One can verify this by adding '-o' to grep:

          echo '192.168.0.999' | grep -oE "$(rgxg cidr 192.168.0.0/24)"
          192.168.0.99
          $

       As rgxg cannot know in which context the generated regular expression is used, it is up to
       the  user  to ensure that the regular expression works as expected (e.g. by adding anchors
       like '^' and '$').

       In the example above adding line anchors leads to the expected behaviour:

          $ echo '192.168.0.999' | grep -E "^$(rgxg cidr 192.168.0.0/24)$"
          $

SEE ALSO

       regex(7)

AUTHOR

       Hannes von Haugwitz <hannes@vonhaugwitz.com>