Nice one!

Author: codewithmide

Telephone_Number_Validator/script.js

@@ -0,0 +1,7 @@
+function telephoneCheck(str) {
+    // used regex in checking all required number
+    let regex = /^1?\s?(\d{3}|\(\d{3}\))-?\s?\d{3}-?\s?\d{4}$/gm
+    return regex.test(str);
+  }
+  
+  telephoneCheck("555-555-5555");