How do I create a regex that only allows extensions and not full phone numbers?

[kevin_eldridge]

I am attempting to create two Client Scripts that uses regex to validate the information being entered. We want to use this for the following two fields:

Phone Number (###-###-####)

Phone Number Extension x#### or X####)

Can someone please assist me in creating the regex I need to use in the client script to write this validation?

I have searched and found several references on RegEx, such as JavaScript RegExp Reference How to validate a string field for proper phone number format

However, I must not understand fully how RegEx is supposed to work to validate the data being entered as my code keeps returning invalid.

Thank you,

Kevin

[Pradeep Sharma]

HI Kevin,

You may find below link helpful.

Validation for (xxx) xxx-xxx phone number format

[kevin_eldridge]

Hello Pradeep,

Thank you for your response. That will probably answer my ###-###-#### portion of the two questions I asked above. However, for the other portion for the x#### or X####, what would you suggest I use? My code is listed below that I am currently attempting to use and not having much luck with:

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

         // Pattern for the regex comparison of the value entered into the "Phone number extension" field
         // uses the format x#### or X####
         if (newValue) {
                   if (newValue != oldValue) {
                             var phoneTempVar = newValue;
                                       if (phoneTempVar.length == 5) {
                                                 phoneTempVar = phoneTempVar.replace(/[^\d]+/g, '');
                                                 .replace(/^[xX]\d{4}$/, '$1$2');
                                                 g_form.setValue('u_phone_number_extension', phoneTempVar);
                                       }
                   }
         }
}

[Brian Dailey1]

Hi Kevin,

Here are a couple of client scripts I've used together to validate phone number entry (basic 10-digit, area code + number, etc.).   It's a little more forgiving, as it strips extraneous formatting and typos to return just the numeric part of the entry, and removes any leading "1" that is entered as well.   You can include it and have it called from an onChange client script if you like using the checkPhoneNumber(...) function.   Notice that the "var check =..." statement sets the number of digits (e.g., 10) used to determine if the entry is a valid number, you could adjust this to use for both your phone numbers and extensions using the numDigits parameter that gets passed into checkPhoneNumber(...):

function checkPhoneNumber(fieldName, control, oldValue, newValue, isLoading, numDigits) {

      if (isLoading || newValue == '' || newValue == oldValue || control.getAttribute('validated') == 'true') {

              control.setAttribute('validated',"false");

              return;

      }

      try{

              g_form.hideFieldMsg(fieldName, true);

              var check = isValidPhone(newValue, numDigits);

              if(check.isValid){

                      control.setAttribute('validated',"true");

                      g_form.setValue(fieldName, check.number);

                      return;

              }

              g_form.showFieldMsg(fieldName,"Not a Valid Phone Number");

              g_form.setValue(fieldName, oldValue);

      }

      catch(e){

              g_form.addErrorMessage("Error: " + e);

      }

}

function isValidPhone(value, reqLength){

      var result = {};

      var stripped = value.replace(/[\D]/gi, '').replace(/^1/, '');

      result.number = ((result.isValid = stripped.length == reqLength)== true) ? stripped:'';

      return result;

}

See if that will work for you.   Otherwise, you could use more explicit regex statements if you really wanted to match exactly on "###-###-####" and "x####"/"X####".

Thanks,

-Brian

[kevin_eldridge]

Hello Brian,

That is exactly what I am attempting to perform, use more explicit regex statements to capture, "###-###-####" on a Phone Number field and "x####" or "X####" on a Phone Number Extension field. I greatly appreciate the regex statement you provided and am looking for how to capture those values using the onChange function or another variation as you provided.

Thank you for your assistance,

Kevin