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Regular Expression Details

Title Test Find Pattern Title
Expression
\b(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])\b
Description
Most Concise RegExp for matching Decimal IPs. If nothing else, it'll make your code easier to read. (And I know that \d?\d is \d{1,2} but that's 2 extra characters.) --Update: darkone noticed 8 characters could be shaved down. I've edited it to reflect this. Thanks, darkone!
Matches
217.6.9.89 | 0.0.0.0 | 255.255.255.255
Non-Matches
256.0.0.0 | 0978.3.3.3 | 65.4t.54.3
Author Rating: The rating for this expression. Sean Schricker
Source
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Existing User Comments

Title: dfg
Name: dfg
Date: 6/13/2008 10:56:42 AM
Comment:
sdf


Title: Buggy
Name: Jrf
Date: 9/21/2005 2:48:43 PM
Comment:
I believe this regex to be buggy. It okays the following ip-address while it shouldn't (note the leading zeros): 255.255.255.02 02.234.2.1


Title: Failure
Name: Duke Nukem
Date: 9/30/2004 4:34:40 AM
Comment:
Caution: 1.2.3.4.5 matches also. Use ^...$ instead of \b...\b


Title: another approach
Name: darkone
Date: 9/17/2004 11:38:27 AM
Comment:
([01]?\d?\d|2[0-4]\d|25[0-5]) (matches one number) is a little bit shorter and should also do the job.


Title: regex match help
Name: sanjay
Date: 7/13/2004 11:58:12 AM
Comment:
I want to match a string which is not of a certain length say between 2 and 20 and it should not contain numbers or special characters except [. -]. I'm not able to find a pattern That will match a string NOT of a certain length.


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