Phone Number Validation on Form Submission

Client-Side Components/Client Scripts/Phone Number Validation/README.MD

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+We are building a form in ServiceNow where a user must enter their phone number.
+The requirement is that only valid Indian mobile numbers should be accepted. A valid number should:
+
+Optionally start with 0 or 91
+
+Be exactly 10 digits long
+
+Start with digits 6, 7, 8, or 9
+
+If the user enters anything invalid, the form should not be submitted, and an error message should be shown.
+
+g_form.getValue → gets the phone field value.
+Regex → allows numbers like 9876543210, 0919876543210, 919876543210.
+Validation → If the value is invalid, shows alert and blocks submission.

Client-Side Components/Client Scripts/Phone Number Validation/phoneNumberValidation.js

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+function onSubmit() {
+
+var phone=g_form.getValue('phone_number_field');//09898989
+var pregex=/(0|91)?[6-9][0-9]{9}/;
+if(!pregex.test(phone)){
+    alert("Enter correct phone number");
+    return false;
+}