更新:

^([0-9]|[1-9][0-9])$

匹配 0-99.不匹配带前导零的值.根据您的应用程序，您可能需要对括号和 或 符号进行转义.

Matches 0-99. Doesn't match values with leading zeros. Depending on your application you may need to escape the parentheses and the or symbol.