单反斜杠的正则表达式模式

Question

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.

Answer 1

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.

Answer 2

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

The double \\ is used to escape the backslash.

Answer 3

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.

Answer 4

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, ".*\\\\\\\\.*")