added comprehensive email regex pattern (#2052)

Author: SumithThota

Client-Side Components/Client Scripts/Validate Email Format/README.md

@@ -1,3 +1,9 @@
 onSubmit Function: This client script validates the email format when the form is submitted.
-Regular Expression: It uses a regex pattern to check if the entered email matches a standard email format.
+Regular Expression: It uses a comprehensive email regex pattern to check if the entered email matches a standard email format.
+
+This pattern can handles:
+- Quoted local parts (`"john doe"@example.com`)
+- Dots within the local segment (`first.m.last@subdomain.org`)
+- IP-based domains (`user@[192.168.1.1]`)
+
 Error Message: If the email is invalid, an error message is displayed, and form submission is prevented.

Client-Side Components/Client Scripts/Validate Email Format/ValidateEmailFormat.js

@@ -2,7 +2,8 @@
 
 function onSubmit() {
     var emailField = g_form.getValue('email');
-    var emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    //Comprehensive email regex pattern
+    var emailPattern = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
 
     if (!emailPattern.test(emailField)) {
         g_form.addErrorMessage('Please enter a valid email address.');