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It can be done, but it is not pretty :)$ip=~/\b((2[0-5][0-5]\.)|(1?[0-9]?[0-9]\.)){3}((2[0-5][0-5])|(1?[0-9]?[0-9]))\b/

You can try this:$ip=~/(\d+)\.(\d+)\.(\d+)\.(\d+)/;
if ($1>=0 && $1<=255 && $2>=0 && $2<=255 && $3>=0 && $3<=255 && $4>=0 && $4<=255)
{
}

if ($input =~ /\015\012/)



On most operating systems, lines in files are terminated by one or two characters that signal the end of the line. The characters vary from system to system. Unix...

Remove the chomp part.
$input = <STDIN>;
then if ($input =~ /\n/) should work.