Match Pattern help - single capital letter followed by numbers and nothing else

[TeraTech]

I am trying to create an expression for the Match Pattern function.  The pattern I want to match is: starts with any single capital letter, followed by any number of digits 0 to 9. There cannot be any other characters following the last digit.

Acceptable:

A1

B22

C333

Filter out:

A

AA

ABC

ABC123

aaa456

ABC123abc

AAA456def

B789ghi

C1J

D55:6

a123

This is what I have so far "^[B,D,E][0-9]"  however it allows characters following the last digit.

I've read that the Match Regular Expression is slower than the Match Pattern function. I have this in a loop so would like to use the Match Pattern function function if possible.

Thanks!

[BertMcMahan · Accepted solution]

Try ^[A-Z][0-9]+$