Question

I want to put inside parentheses the non-alphanumeric characters within a text.

For example:

"I would like to add * parentheses % around certain text within cells*."

I want to put inside parentheses via regex method the non-alphanumeric characters within above string.

Result:

"I would like to add (*) parentheses (%) around certain text within cells(*)."

Answer 1

string s = Regex.Replace(
    @"I would like to add * parentheses % around certain text within cells*.",
    @"([^.\d\w\s])", "($1)");

or to be more selective:

string s = Regex.Replace(
    @"I would like to add * parentheses % around certain text within cells*.",
    @"([*%])", "($1)");