請寫出下列敘述的正規表達式（regular expression）：
“Each word must start with two digits, followed by a upper case letter, and
then followed by at least one letter either upper case or lower case.”
請問關於這段的表達式，沒有相關 關鍵字 要如何解答呢??
請益一下解答的方向是??

[0-9][0-9][A-Z][a-zA-Z]* 之類的...

\d\d[A-Z][a-zA-Z]+