Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Re: Don't Use Regular Expressions To Parse IP Addresses!

by sieve (Initiate)
on May 18, 2007 at 20:25 UTC ( #616269=note: print w/ replies, xml ) Need Help??


in reply to Don't Use Regular Expressions To Parse IP Addresses!

If you do use a regular expressions to parse IPv4 in decimal, you could use:

(1?\d\d?|2[0-4]\d|25[0-5])(\.(1?\d\d?|2[0-4]\d|25[0-5])){3}


Comment on Re: Don't Use Regular Expressions To Parse IP Addresses!
Download Code
Re^2: Don't Use Regular Expressions To Parse IP Addresses!
by Anonymous Monk on Nov 08, 2007 at 00:07 UTC
    Not really - the above regex is wrong. Try it on 10.76.110.219 and it will match only 10.76.110.21 (since 1?\d\d? will match 21 and stop and not look for the 2[0-4]\d rule)
      It works inside the correct context. For example, if you supply a leading ^ and trailing $ then all is well. You have to supply your own context.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://616269]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (7)
As of 2014-09-19 01:55 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (129 votes), past polls