-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.

Match either lion, elephant, rhino, buffalo or leopard:

$ rgxg alternation lion elephant rhino buffalo leopard
(lion|elephant|rhino|buffalo|leopard)

-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.

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})

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

-h

Display help and exit.

Match '1+(2*(3-4))':

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

-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.

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])