CODEWITHSUNDEEP
c#regex
Viper
Viper

Reputation: 627

RegExp in C# to find a "(number)" expression

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?

Upvotes: 0

Views: 130

Answers (2)

sch
sch

Reputation: 27506

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]+\\)");

Upvotes: 4

mdm
mdm

Reputation: 12630

At the moment you are only looking for a single digit, try this:

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

Which searches for one or more digits in the range 0-9. Escaping the parentheses will also ensure that only numbers between the brackets are found.

Upvotes: 0

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