Validate phone format 123 234 5678 no regex

Client-Side Components/Client Scripts/validate phone number/Readme.md

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+Phone Number Validation — Client Script 
+Overview
+
+This Client Script validates that users enter their phone numbers in the strict format: (123) 456-7890.
+
+It is triggered whenever the Phone field changes on a sys_user record. If the input does not match the required format, the script:
+
+Displays an inline error message directly below the field.
+
+Clears the invalid input so the user can re-enter the correct value.
+
+This script is designed to be dynamic, simple, and user-friendly.
+
+Features
+
+Ensures phone numbers follow the exact format (123) 456-7890.
+
+Provides immediate feedback via field-level error messages.
+
+Clears invalid entries automatically to prevent submission errors.
+
+Works on Classic UI forms and provides clear messaging to the user.
+
+Usage Instructions
+1. Create the Client Script
+
+Navigate to System Definition → Client Scripts.
+
+Click New to create a client script.
+
+2. Configure the Script
+
+Name: Phone Number Validation
+
+Table: sys_user 
+
+Type: onChange
+
+Field: phone

Client-Side Components/Client Scripts/validate phone number/validate_phone_format_(123)_456-7890_no_regex.js.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || !newValue) return;
+
+    var fieldName = control.name;
+
+    // Split the string
+    var area = newValue.substring(1, 4);
+    var firstThree = newValue.substring(6, 9);
+    var lastFour = newValue.substring(10, 14);
+
+    if (
+        newValue[0] !== '(' || newValue[4] !== ')' || newValue[5] !== ' ' || newValue[9] !== '-' ||
+        isNaN(parseInt(area)) || isNaN(parseInt(firstThree)) || isNaN(parseInt(lastFour))
+    ) {
+        g_form.showFieldMsg(
+                fieldName,
+                'Phone Number must be in the format (123) 456-7890',
+                'error',
+                false
+            );
+        g_form.setValue(fieldName, '');
+    }
+}