Regular expression for validating ip address
Putting the value of the subject IP address inside parenthesis and assigning it to itself thereby turns it into an array where each dot separated number is assigned to an array slot.
Note that there's no need to test that the numbers are greater than or equal to zero because the regular expression test has already eliminated any thing that doesn't consist of only dots and digits.
Because it considers IP’s 10.0 as correct IP which it shouldn’t 2nd regex is difficult to understand but won’t accept incorrectly typed IP’s as 10.010.05.2 and accepts only in 10.10.5.2 format.
The script also shows the use of perl’s inbuilt module Data: Validate: IP for IP address validation.
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The status of a command/function is stored in the bash variable "$? variable so that rather than parsing words as whitespace separated items, bash parses them as dot separated.
——————————————————————————— #IP_print “\n Enter an IP addres:”; my $ipadr = This entry was posted on April 18, 2013 at PM and is filed under Perl.
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I also don’t want to allow every possible technically valid URL — quite the opposite.
See the URL Standard if you’re looking to parse URLs in the same way that browsers do.
I came across this fact while researching how to best go about validating a user-entered IP address in a Ruby application. It turns out the Resolv standard library includes the Resolv:: IPv4 class and the Resolv:: IPv6 class, each of which expose a regular expression to validate their respective formats.