Regex in javascript - match string like "ABC12"

Question

How to match next line using regex in javascript?

• Has a total of 5 characters
• The first three characters are capital letters
• The last 2 characters are just numbers

I have this template, [AZ]{3}[0-9]{2} , but it seems that it is still missing something. Thanks for the help.

Answer 1

You will also need anchors :

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

Otherwise, the substrings will also match (for example, ABC12 inside xyzABC1234 ).

• ^ means "start of line"
• $ means end of line