How can I validate the range A-K without I, using a regex?

Question

I need to validate a string which will have the format [char][char][num][num][char].

I need to find out if the [char] has anything between AK but not I.

Answer 1

Use a char class and add the two ranges:

[A-HJ-K]

JK is not really a range and adding the other requirements, try something like:

^[A-HJK]{2}\d{2}[A-HJK]$

See it here on Regexr .

^ is an anchor for the start of the string

$ is the anchor for the end of the string

Those anchors are important, otherwise you can match substrings.

Answer 2

[a-hj-k]{2}\d{2}[a-hj-k]

Debuggex Demo