正则表达式替换错误的符号C＃

Question

I need to replace wrong symbols except chars and digits in my string with dash character "-"

var myString = "this=is+/* wrong!@# string^&*(";

I use

Regex.Replace(myString, "[^0-9a-zA-Z]+", "-");

and as a result it's "this-is----wrong----string----"

but I need "this-is-wrong-string"

What should I change in my RegEx. Thanks!

Answer 1

Unable to reproduce:

using System;
using System.Text.RegularExpressions;

class Test
{
    static void Main()
    {
        var input = "this=is+/* wrong!@# string^&*(";
        var output = Regex.Replace(input, "[^0-9A-Za-z]+", "-");
        Console.WriteLine(output);
    }                   
}

Output: this-is-wrong-string-

So you may want to use TrimEnd('-') to get rid of the trailing "-", but otherwise it looks fine to me. Compare your code with my short but complete program, and if you can't find what's wrong, come up with a similar short but complete program which demonstrates the problem.

Answer 2

Your regex works for me:

PS> "this=is+/* wrong!@# string^&*(" -replace '[^0-9a-zA-Z]+','-'
this-is-wrong-string-

But you need to remove trailing - afterwards.