Regular expression for Indian mobile numbers (ServiceNowDevProgram#849)

* Create code.js

* Create readme.md

Author: nthumma

Regular Expressions/Indian Mobile Numbers/code.js

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+var regex = /^(?:(?:\+|0{0,2})91(\s*[\ -]\s*)?|[0]?)?[789]\d{9}|(\d[ -]?){10}\d$/;
+var fieldValue = '919876543210'; // Replace with your field name
+if (fieldValue && fieldValue.match(regex)) {
+        gs.info('Mobile number is valid.');
+    } else {
+        gs.info('Invalid mobile number format.');
+    }

Regular Expressions/Indian Mobile Numbers/readme.md

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+# Here's an example of how you can utilize regex in a Business Rule in ServiceNow:
+
+```
+(function executeRule(current, previous) {
+var regex = /^(?:(?:\+|0{0,2})91(\s*[\ -]\s*)?|[0]?)?[789]\d{9}|(\d[ -]?){10}\d$/;
+var fieldValue = '919876543210'; // Replace with your field name
+if (fieldValue && !fieldValue.match(regex)) {
+        current.setAbortAction(true);
+        gs.info('Invalid mobile number format.');
+    }
+})(current, previous);
+```
+# Valid Scenarios 
++91-9883443344 <br />
+9883443344 <br />
+09883443344 <br />
+919883443344 <br />
+0919883443344 <br />
++919883443344 <br />
++91-9883443344 <br />
+
+# Invalid Scenarios
+
+WAQU9876567892 <br />
+ABCD9876541212 <br />
+0226-895623124 <br />
+6589451235 <br />
+0924645236 <br />
+0222-895612 <br />
+098-8956124 <br />
+022-2413184 <br />