Question

How to match the following string using regular expression in JavaScript?

1. Has a total of 5 characters
2. First 3 charaters are capital letters
3. Last 2 characters are only numbers

I have got this pattern, [A-Z]{3}[0-9]{2}, but seems that it’s still missing something.

Answer 1

You also need anchors:

var regexp = /^[A-Z]{3}[0-9]{2}$/

Otherwise, substrings will also match (like ABC12 within xyzABC1234).

• ^ means “start of string”
• $ means “end of string”