CODEWITHSUNDEEP
c#regex
Thomas
Thomas

Reputation: 2108

Regex pattern for single backslash

I am trying to match the below string. I am not able to get it right. Could someone please help?

string str = "test\tester";
            if (Regex.IsMatch(str, "/\\/"))
                MessageBox.Show("Match");
            else
                MessageBox.Show("Not match");

I am wondering what is the Regex pattern I should use to get this matched.

Upvotes: 0

Views: 1284

Answers (4)

Bernard
Bernard

Reputation: 7961

Simply use: Regex.IsMatch(str, @".*\\.*")

The double \ is used to escape the backslash.

Upvotes: 1

egrunin
egrunin

Reputation: 25053

I suspect your test code is wrong.

What you're testing:

string str = "test\tester";

But if what you're getting is "two parameters separated by a backslash", this should be 

string str = "test\\tester";

This is because a backslash is represented in a constant as \\. Because \t happens to represent a tab character, your test code isn't throwing an error at compile time. If you did this:

string str = "mytest\mytester";

You'll get an error, because \m isn't valid.

Upvotes: 1

Dave Bish
Dave Bish

Reputation: 19636

In this case, you're way better of using string.Contains() from a performance point of view:

string str = @"test\tester"; //<- note the @

if (str.Contains("\\"))
    MessageBox.Show("Match");
else
    MessageBox.Show("Not match");

Be aware that in your test original string, you need to escape the \ or @ the string.

Upvotes: 2

Xynariz
Xynariz

Reputation: 1243

The regex for a single backslash is \\. If you want to make the string match exactly in C#, use the @ operator:

Regex.IsMatch(str, @".*\\.*")

Alternatively, you can use C#'s escape characters:

Regex.IsMatch(str, ".*\\\\.*")

Upvotes: 0

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