CODEWITHSUNDEEP
c#regex
CrzyGK
CrzyGK

Reputation: 3

How can I combine regex with a string?

I am fairly new to using regex and I am not entirely clear on the syntax for everything yet. Basically I am stuck on a bit of code where I have: 

if(@"\d{2,}\s"+string == Path.GetFileNameWithoutExtension(dir)) 
{ 
    do stuff 
}

My problem is that it won't match anything. I basically have a bunch of files that it's searching through that all have 2 digits and a space, then the name that the user is searching for. Can I combine regex + string like that or is the problem with my regex/statement? Just for clarity, it will match when I actually remove the two digits and space from the files. I apologize if the problem is obvious, I've only been playing with regex for a few days...

Upvotes: 0

Views: 1399

Answers (2)

Greg
Greg

Reputation: 11480

You actually shouldn't have to use a Regular Expression in that instance, in fact that may be over complicating the goal.

string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
string [] file = Directory.GetFiles(path, @"11_*.txt", SearchOption.AllDirectories);
foreach(string f in file)
{
    // Do Something.
}

If your entirely headset on utilizing Regular Expressions, you would do something more along these lines:

using System.Text.RegularExpressions;

...

    string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
    var file = Regex.IsMatch(path, @"\d{2,}\2");
    if(file == true)
    {
         // Do Something
    }

That is one way to use Regular Expressions, they can be even more powerful with Linq. I would highly recommend researching this on the MSDN, it has some solid resources.

Upvotes: 0

p.s.w.g
p.s.w.g

Reputation: 149030

Your if statement is not attempting to match a regular expression pattern, it's simply comparing two strings. That's what the Regex.IsMatch method is for. Also you will probably want to use Regex.Escape to combine a regex pattern with an arbitrary string.

Try this:

using System.Text.RegularExpressions;

...

var pattern = @"\d{2,}\s" + Regex.Escape(myString);
var fileName = Path.GetFileNameWithoutExtension(dir);
if (Regex.IsMatch(fileName, pattern))
{ 
    // do stuff 
}

Upvotes: 3

Related Questions