Question

I have a description text file with content constructed in such manner:

Book title - (number)

Currently user needs to find book title, then reads the book number and looks for the appropriate file (number.txt is a file name of book).

I want to use Regexp class to extract “(number)” expression. My sample code doesn’t work (returns TRUE even if “( )” don’t exist:

Regex r = new Regex("([0-9])");

Could you help me to construct correct RegExp?

Answer 1

You should escape the parentheses:

Regex r = new Regex(@"\([0-9]\)");

And if number contains more that one digit, you should add +:

Regex r = new Regex(@"\([0-9]+\)");

Or

Regex r = new Regex("\\([0-9]+\\)");