Question

I am trying to write a regular expression that can extract (possibly multiple) strings of four hexadecimal numbers/letters.

I could do something like this:
/^[A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9][A-Fa-f0-9]/

but is there a better way?

It seems like the repeat operator:

a{n} Matches ‘a’ repeated exactly n times.

a{n,} Matches ‘a’ repeated n or more times.

a{n, m} Matches ‘a’ repeated between n and m times inclusive.

Would work, but the following regular expression does not seem to work:

/^[A-Fa-f0-9]{4}+/

I’m trying to match strings like:

AA00

AA00FFAA

0011FFAA0022

and so on. Each string will be on it’s own line.

Thanks!

Answer 1

Try this:

/^(?:[A-Fa-f0-9]{4})+$/