Late reply - nevertheless:
There are phone number fields (starting in Dublin) - maybe that helps:

Using Phone Number Fields - ServiceNow Wiki

We recently upgraded to Eureka and the phone number field type works out perfectly.

what type of phone number?? US international both... it complicates things a LOT if not dealing with just one country

this is the standard function/format i use for a regex test... just look up a regex that tests for phone numbers that you like and plug it in the regex variable, and put your field and message in the err_field and err_message

function onChange(control, oldValue, newValue, isLoading) {

if (!isLoading){

    var err_field = 'u_gl_period';

    var err_message = 'GL Period must be at formatted as mm-yyyy',

  regex = /^(0[1-9]|1[012])\-(19|20)\d{2}$/;

    var err_flag = 'false';

    err_flag = regex.test(g_form.getValue(err_field));

    g_form.hideErrorBox(err_field);

    if (!err_flag){

g_form.showFieldMsg(err_field,err_message,'error');

            g_form.clearValue(err_field);

    }

    else{g_form.hideErrorBox(err_field);}

}

}

Wouldn't it be better to change the format typed in to the desired format? This is what most contact software does.

This could be done in an onchange client script. The script should get rid of everything except the numbers, then re-format properly. Then it should compare the new string to the previous one (don't update the field if it hasn't changed) prior to updating the field. Without that test you could get stuck in an update loop.

Let me know if you need coding help on that solution.

Hi Quan,

Here's a fairly lightweight script that we use onChange on variables pretty frequently. It allows for a few different phone number formats and uses a standard popup.

function onChange(control, oldValue, newValue, isLoading) {


   if(isLoading || newValue == ''){


           return;


   }


   // Allows formats of (999) 999-9999, 999-999-9999, and 9999999999


   var pattern = /^[(]?(\d{3})[)]?[-|\s]?(\d{3})[-|\s]?(\d{4})$/;


   if(!pattern.test(newValue)){


           alert('Phone enter a valid phone number');


           g_form.setValue('variablename', '');


   }


}