怎么样:

^[0-9+-]*[0-9][0-9+-]*$

这确保字符串中的某处至少有一个数字. (虽然看起来可能有很多回溯.但是，另一方面，它没有在另一个+或*内包裹+或*，我也不喜欢.)

This ensures that there is at least one digit somewhere in the string. (It looks like it might have a lot of backtracking, though. But on the other hand it doesn't have a + or * wrapped inside another + or *, which I don't like either.)