lua pattern match help

[Joseph Stewart <joseph.stewart@...>]

Can anyone suggest a pattern to match text in the following format:

Must start with a upper-case letter.
Must be followed by one or more lower-case letter.
Above conditions must repeat at least one time (but could be many).

Here are some examples that follow this pattern:

ThisMatches
ThisMatchesToo

Here are example pattern that don't match:

doesntMatch
!dosentMatch
This1DosentMatch

Can this be done with a simple pattern, or will I need to put more
code in place?

Thanks in advance for your help!
-joe