Remove '\' char from string c#

Question

I have the following code

string line = ""; 

while ((line = stringReader.ReadLine()) != null)
{
    // split the lines
    for (int c = 0; c < line.Length; c++)
    {
        if ( line[c] == ',' && line[c - 1] == '"' && line[c + 1] == '"')
        {
            line.Trim(new char[] {'\\'}); // <------
            lineBreakOne = line.Substring(1, c  - 2);
            lineBreakTwo = line.Substring(c + 2, line.Length - 2);
        }
    }
}

I have added a comment net to the line I am wondering about. I want to remove all '\' chars from the string. Is this the correct way to to this? I doesnt work. All \ are still in the string.

`Trim(new char[] {'\\'})` will remove all \ characters from the start or the end. It 'trims' them off. As @user978511 states, you can use `Replace("\\", "")`. (FYI, his use of the @ character means "take this string literally, without applying escaping rules") — JohnL, Dec 05 '11 at 09:51

score 133 · Accepted Answer · answered Dec 05 '11 at 09:47

133

You could use:

line.Replace(@"\", "");

or

line.Replace(@"\", string.Empty);

answered Dec 05 '11 at 09:47

Andrey Marchuk

13,301
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8

That's because Replace does not change the string itself, it returns the changed string. So you have to do like my answer, and write `line = line.Rep...` – Øyvind Bråthen Dec 05 '11 at 09:52
1

These are not slashes. These are escape characters. They are used here to escape quotes. Consider using single quote instead of double quotes. You will not need slashes there then. – Andrey Marchuk Dec 05 '11 at 09:52
1

@PoiXen - In the string you have posted, `\"` is an escape sequence that lets `"` appear in the string. There are no back slash characters in it. – Oded Dec 05 '11 at 09:53
For an optimized solution: http://stackoverflow.com/questions/1120198/most-efficient-way-to-remove-special-characters-from-string – Gerhard Powell Mar 11 '13 at 16:27
does not work for this "\"something://player.vimeo.com/video/27735162\"" – reza.cse08 Mar 03 '19 at 05:51
1

@reza.cse08 Because there's no \ in you string, you have quote, which is escaped with \ - like \" – Andrey Marchuk Mar 06 '19 at 10:19

score 8 · Answer 2 · answered Dec 05 '11 at 09:47

8

You can use String.Replace which basically removes all occurrences

line.Replace(@"\", "");

answered Dec 05 '11 at 09:47

Sandeep Bansal

6,280
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score 7 · Answer 3 · answered Dec 05 '11 at 09:47

7

to remove all '\' from a string, simply do the following:

myString = myString.Replace("\\", "");

answered Dec 05 '11 at 09:47

Øyvind Bråthen

59,338
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score 7 · Answer 4 · answered Dec 05 '11 at 09:48

7

line = line.Replace("\\", "");

answered Dec 05 '11 at 09:48

craig1231

3,769
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score 6 · Answer 5 · answered Dec 05 '11 at 09:47

6

Why not simply this?

resultString = Regex.Replace(subjectString, @"\\", "");

answered Dec 05 '11 at 09:47

FailedDev

26,680
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2

I think that needs to be either "\\" or @"\" doesn't it? – Bali C Dec 05 '11 at 09:48
1

@BaliC Actually no. With one **"\"** you get parsing "\" - Illegal \ at end of pattern. .NET 3.5 – FailedDev Dec 05 '11 at 09:52

score 5 · Answer 6 · edited Dec 05 '11 at 09:56

5

Try to replace

string result = line.Replace("\\","");

edited Dec 05 '11 at 09:56

Glory Raj

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answered Dec 05 '11 at 09:52

Veaceslav Gaidarji

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score 4 · Answer 7 · answered Oct 20 '20 at 21:55

I have faced this issue so many times and I was surprised that many of these don't work.

I simply deserialize the string with Newtonsoft.Json and I get cleartext.

string rough = "\"call 12\"";
rough = JsonConvert.DeserializeObject<string>(rough);

//the result is: "call 12";

score 4 · Answer 8 · answered Dec 05 '11 at 09:47

4

Try using

String sOld = ...;
String sNew =     sOld.Replace("\\", String.Empty);

answered Dec 05 '11 at 09:47

Shai

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score 2 · Answer 9 · answered Dec 05 '11 at 09:50

2

Trim only removes characters at the beginning and the end of the string, that's why your code doesn't quite work. You should use Replace instead:

line.Replace(@"\", string.Empty);

answered Dec 05 '11 at 09:50

Falanwe

4,636
22
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score 2 · Answer 10 · answered Dec 05 '11 at 09:53

         while ((line = stringReader.ReadLine()) != null)
         {
             // split the lines
             for (int c = 0; c < line.Length; c++)
             {
                 line = line.Replace("\\", "");
                 lineBreakOne = line.Substring(1, c - 2);
                 lineBreakTwo = line.Substring(c + 2, line.Length - 2);
             }
         }

Remove '\' char from string c#

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