在C＃中使用字符“-”的正则表达式

Question

I use VS 2012 and RegExp in C#.
I have an regular expression like this:

^CREATE OR REPLACE PACKAGE ([\w]+).([\w]+) IS

I read contents from a file.

I have troubles with character -

Test_A_B is OK.
Test-A_B is KO .

I tried using Regex.Escape but it's still wrong.

Unit test code:

var pattern1 = @"^CREATE OR REPLACE PACKAGE ([\w]+).([\w]+) IS";
var regexPackage = new Regex(pattern1);

var contents = @"CREATE OR REPLACE PACKAGE ZZZ.Test_A_B IS";
match1 = regexPackage.Match(contents);
Assert.IsTrue(match1.Success);
Assert.AreNotEqual(0, match1.Groups.Count);
Assert.AreEqual("Test_A_B", match1.Groups[2].Value);

contents = @"CREATE OR REPLACE PACKAGE ZZZ.Test-A_B IS";
//contents = Regex.Escape(contents);
match1 = regexPackage.Match(contents);
Assert.IsTrue(match1.Success); <===== FAILS
Assert.AreNotEqual(0, match1.Groups.Count);
Assert.AreEqual("Test-A_B", match1.Groups[2].Value);

Any suggestions?

Answer 1

\\w includes alphanumeric characters as well as the underscore. It doesn't include the dash.

Simply replace [\\w]+ in your regex with [-\\w]+ to include the dash.

As a side note, the dash has a special meaning in character classes. It either needs to be first in the class, or last, or be escaped with a backslash.