正则表达式字母/数字组合

Question

Trying to come up with a regex to capture groups like AB1234 or BA2321 . Essentially need to capture anything that starts with AB or BA and followed by 4 digits.

Currently, I have something like this, but that seems to not take numbers into account

(AB|BA)\d{4}

Answer 1

May be you want:

\b((?:AB|BA)\d{4})\b

Letters + digits will be in group 1

Answer 2

我会用这个：

^(AB|BA)\d{4}$