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OT: PERL Question

What is the most compact way to express this IP range with a PERL regular expression:

114.108.128.0 - 114.108.191.255

Thanks! ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Reply to
Jim Thompson
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here's an ugly one (they all are) from an IP range regex generator

^114\.108\.(1(2[8-9]|[3-8][0-9]|9[0-1]))\.([0-9]|[1-9][0-9]|1([0-9][0-9])|2([0-4][0-9]|5[0-5]))$

Reply to
Cydrome Leader

Yup. That's what I was coming up with... ugly ;-) ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

Convert it to 32-bit binary and test the top 18 bits (discard 14):

use Net::IP; my $ip = new Net::IP("114.108.128.0"); print $ip->binip(), "\n";

=> 01110010011011001000000000000000

Clifford Heath.

Reply to
Clifford Heath

as as CIDR range 114.108.129.0/19 but I guess you can't use that.

as regex, assuming input is four-part ip-addresses only.

114\.108\.1(2[89]|[3-8]\d|9[01])\.\d+ 
--
  \_(?)_
Reply to
Jasen Betts

Since in the context it will be used you don't mind if it catches malformed IP addresses as well you could swap \d for "." saving 2.

114\.108\.1(2[89]|[3-8].\9[01])\..+

I prefer yours though which is exact on IP addresses. (but he did ask for the shortest regex)

--
Regards, 
Martin Brown
Reply to
Martin Brown

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