10 January, 2020 - Reading time: ~1 minute
This is just a simple JavaScript function with some regex used to validate an alidate a MAC Address format. I've used this on ServiceNow instances and before that as a PowerShell function on various Microsoft environments.
Find the JavaScript function below with a couple of examples.
function isMacValid(mac) {
var regexMac = /^((([0-9A-F]{2}:){5})|(([0-9A-F]{2}-){5})|([0-9A-F]{10}))([0-9A-F]{2})$/i
var testRegex = mac.match(regexMac) >= 0;
// Returns true if it's a incorrect format
if (testRegex) {
return true;
// Returns false if it's a correct format
} else if (!testRegex) {
return false;
}
}
Example of usage (wrong mac format)
isMacValid('1a:2b:3c:4d:5e6f');
Example of usage (correct mac format)
isMacValid('1a:2b:3c:4d:5e:6f');