正则表达式 - 在C＃中的括号和字母数字字符之间插入空格

Question

I want to insert spaces between words, numbers, and parentheses. For example i have the string

string a = "20and(2and 3)";

and i want to have

string b = "20 and ( 2 and 3 )";

I found this method for inserting spaces between words and numbers, and it works. But it doesn't insert spaces when there are parentheses...

b = Regex.Replace(a, "(?<=[0-9])(?=[A-Za-z])|(?<=[A-Za-z])(?=[0-9])", " ");

Can anyone help me with this please...? Thank You very much.

Answer 1

How about this instead:

b = Regex.Replace(a, "[a-zA-Z]+|[0-9]+|[()]", "$0 ");

Although this will insert a space at the end as well. If that is a problem, you can just Trim the result string:

b = Regex.Replace(a, "[a-zA-Z]+|[0-9]+|[()]", "$0 ").Trim();