Write an expression or perl script to identify the entered ip address is valid

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Write an expression or perl script to identify the entered
ip address is valid or not?

Question Posted / snehal kashikar

5 Answers
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Write an expression or perl script to identify the entered ip address is valid or not?..

Answer / savitha sridhar

print "Enter an ip address: ";
$ans=<stdin>;
chomp($ans);
if ($ans =~ m/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/)
{
if (($1<=255) && ($2<=255) && ($3<=255) &&
($4<=255))
{
print "An IP Address";
}
else
{
print "Not an IP Address";
}
}
else
{
print "Not an IP Address";
}

Is This Answer Correct ?

12 Yes

1 No

Write an expression or perl script to identify the entered ip address is valid or not?..

Answer / anil

The first reply won't match 192.168.99.99. [0-5] matches
only 0,1,2,3,4,5. How about the other numbers?

Second one is almost correct, but the first octet can't be
'0'. I mean, 0.1.2.3 is not a valid address.

print "Enter an ip address: ";
$ans=<stdin>;
chomp($ans);
if ($ans =~ m/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/)
{
if ( ($1>0) && ($1<=255) && ($2<=255) && ($3<=255) &&
($4<=255))
{
print "An IP Address";
}
else
{
print "Not an IP Address";
}
}
else
{
print "Not an IP Address";
}

Is This Answer Correct ?

2 Yes

1 No

Write an expression or perl script to identify the entered ip address is valid or not?..

Answer / digesh patel

if($ipaddress=~m\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b)
print "\n It is a valid IP address :";

Is This Answer Correct ?

0 Yes

0 No

Write an expression or perl script to identify the entered ip address is valid or not?..

Answer / subhash chandran

if($IP !~ /(((\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}(\d|
[1-9]\d|1\d{2}|2[0-4]\d|25[0-5]))/)
{
print "Valid\n";
}

Is This Answer Correct ?

0 Yes

0 No

Write an expression or perl script to identify the entered ip address is valid or not?..

Answer / snehal kashikar

#! /usr/bin/per
use strict;
#- Use Input
#---------------
my $ip_add = "";

#- Script start
#---------------
print"Enter the IP address\n";
$ip_add = <STDIN>;
chomp($ip_add); # Remove the last "\n" character
$ip_add=$ip_add."\."; # Append . at the end of IP address
#-------Expression to check IP address is valid or not-----#
if($ip_add =~ m/^[0-2]?[0-5]?[0-5]?\.){4}$){
print" Valid IP Address\n";
}else{
print" Invalid IP Address\n"
}

Is This Answer Correct ?

1 Yes

7 No

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