Regular Expressions for IP address

Nandini DM · ‎07-09-2024

Hi,

Regular expression to check below points

1)Field validation to check IP address should not be more than 3 digits if user trying to enter IP range max 255 it should throw an error. ex(255.255.255.255)

2)field should also check, if user try to enter IP address along with slash number which should not exceed more than 32. ex( 10.111.11.111/11) (after slash, number should not be more than 32)

Kindly help!

Thanks.

Rupanjani · ‎07-09-2024

Hi @Nandini DM ,

Write an onChange Client Script on the field.

Assuming field name as - ip_address, below script is written. Tried on PDI and is working as expected.

Change ip_address with actual field name and check

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue === '') {
        return;
    }

	var ipRegex = new RegExp('^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$');
	var regex = new RegExp('^(?:[0-9]|[1-2][0-9]|3[0-2])$');
     
    var isValidIp = '';
	var isSubnet = '';
	isValidIp = ipRegex.test(newValue);

	var splitip = '';
    var ipCheck = '';
    var subnetCheck = '';

	if (newValue.indexOf('/') != -1) {
        splitip = newValue.split('/');
        ipCheck = splitip[0];
        subnetCheck = splitip[1];
		isValidIp = ipRegex.test(ipCheck);
		isSubnet =  regex.test(subnetCheck);
    }	

    if (!isValidIp) {
        g_form.showFieldMsg('ip_address', 'Invalid IP', 'error');
    } else if(!isSubnet && subnetCheck != ''){
		g_form.showFieldMsg('ip_address', 'Invalid Subnet', 'error');
	} 
}

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View solution in original post

jonsan09 · ‎07-09-2024

You could try checking the OOB regex for IP addresses: https://YOURINSTANCE.service-now.com/nav_to.do?uri=question_regex.do?sys_id=f2f52405530020107d13ddee...

Mark Roethof · ‎07-09-2024

Hi there,

Where do you want to apply this? Client side? Core UI or Portal?

Anyway, there is already out-of-the-box code for this which might be enough for your case already? The out-of-the-box regex:
((^\s*(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))\s*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$))

Kind regards,

Mark Roethof

Independent ServiceNow Consultant

10x ServiceNow MVP

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