validation Getting started with validation Validating a name entered by User

Example

Validating the Name entered by a User contain the following check

• Ensure it is not empty
• Ensure it contain only alphabets, space and/or dot.

So, the regular expression for this is

^[A-Z][a-z]*(\.?\s?[A-Z][a-z]*)+$

This means

• ^ -> Should start with

• [A-Z] -> the first letter should be capital case

• [a-z]* -> the leading letters should be small case (Optional and not applicable for Initials. Ex : J. Doe)

• (\.?\s?[A-Z][a-z]*)+ -> A dot (.) and/or a space (" "), then a capital case and small cases. The last + indicates that this part can repeat many times and at least one time it should be there.

• $ end. No further words will be there

Example matching : J. Doe , John Doe, John Doe Doe, John D Doe.

Example in JavaScript

---

var name = "John Doe";
var noname = "123Abc";
console.log(/^[A-Z][a-z]*(\.?\s?[A-Z][a-z]*)+$/.test(name)); // true
console.log(/^[A-Z][a-z]*(\.?\s?[A-Z][a-z]*)+$/.test(noname)); // false