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What regex can I use to match any valid IP-address represented in dot-decimal notation?
495
so you can use grep -oE "\b([0-9]{1,3}\.){ 3}[0-9]{1,3}\b" to grep the ip addresses from your output. Thanks. This works.
\d{1,3}\b will match any IP address just fine. But will also match 999.999. 999.999 as if it were a valid IP address. If your regex flavor supports Unicode, it may even match ١٢٣.
Approach: Regex (Regular Expression) In C++ will be used to check the IP address. Specifying a range of characters or literals is one of the simplest criteria used in a regex.
if($ip=~/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/ &&(($1<=255 && $2<=255 && $3<=255 &&$4<=255 )))
{
print "valid\n";
}
else
{
print "Invalid\n";
}
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