function isIp(arg_ip)
{
var exp=/^(
\d{1,2
}|1
\d\d|2
[0-4
]\d|25
[0-5
])
\.(
\d{1,2
}|1
\d\d|2
[0-4
]\d|25
[0-5
])
\.(
\d{1,2
}|1
\d\d|2
[0-4
]\d|25
[0-5
])
\.(
\d{1,2
}|1
\d\d|2
[0-4
]\d|25
[0-5
])
$/;
var reg = arg_ip.match(exp);
if(reg==null)
{
return false;
}
return true;
}
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