Create telephonenumbervalidatore.js

Author: Umang3072

4. Telephone Number Validator/telephonenumbervalidatore.js

@@ -0,0 +1,5 @@
+function telephoneCheck(str) {
+  return /^(1\s|1)?(\(\d{3}\)|\d{3})(-|\s)?\d{3}(-|\s)?\d{4}$/.test(str)
+}
+
+telephoneCheck("555-555-5555");