[Javascript] How to check FQDN and IPv6 valid check

FQDN

function validfqdn(obj){
var fqdnRegex = new RegExp("^[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,4})$");
if(!fqdnRegex.test(obj.value)){
alert(obj.value +" <#JS_validip#>");
obj.focus();
obj.select();
return false;
}
return true;
}


IPv6 valid check

function ipv6_valid(obj){
//var rangere=new RegExp("^[a-f0-9]{1,4}:([a-f0-9]{0,4}:){2,6}[a-f0-9]{1,4}$", "gi");
var rangere=new RegExp("^((([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}:[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(([0-9A-Fa-f]{1,4}:){0,5}:((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(::([0-9A-Fa-f]{1,4}:){0,5}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))$", "gi");
if(rangere.test(obj.value)){
//alert(obj.value+"good");
return true;
}else{
alert(obj.value+" <#JS_validip#>");
obj.focus();
obj.select();
return false;
}
}


Reference:

• ASUS OpenWRT - RMerl/asuswrt-merlin
• Client side validation: Using Regular expression in Java-script