Hi everyone,

For APN I have this format:
999999X-X999999X-X999999XX-XX999999X-XXXXXX,

where 9 is a digit,
X as upper case alpha,
and - is hyphen.

I have an UDF, which determines, is APN valid by inspecting each character. I'm just curious, is there more elegant and simple solution (and should be faster, of course)?

Thanks in advance.