Replace with in a string in C

Question

I still don t get how to do this  I saw many posts regarding this  but none of the solutions worked for me   I have a string called  a  b   The result I need is  a b   How is this done   I have a text file which has a database connection string pointing to an instance called - Server DbInstance  My aim is to do a string replace in the text file -- replace  Server DbInstance  with another value  say  10 11 12 13  1200    So I have   stringToBeReplaced     Server DbInstance   newString     10 11 12 13  1200     This is where the problem starts  My stringToBeReplaced will always be  Server  DbInstance   and when I search for this string in my text file  the search fails  as the text file doesn t have a string  Server  DbInstance   instead it has only  Server DbInstance   So how do change  Server  DbInstance  to  Server DbInstance

User · Answer

You can simply do a replace in your string like  Str Replace

User · Answer

I was having the same problem until I read Jon Skeet s answer about the debugger displaying a single backslash with a double backslash even though the string may have a single backslash  I was not aware of that  So I changed my code from   text2   text1 Replace                 to  text2   text1 Replace                and that solved the problem   Note  I m interfacing and R Net which uses single forward slashes in path strings

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Regex Unescape string  method converts any escaped characters in the input string   The Unescape method performs one of the following two transformations    It reverses the transformation performed by the Escape method by removing the escape character       from each character escaped by the method  These include the                                       and white space characters  In addition  the Unescape method unescapes the closing bracket     and closing brace     characters  It replaces the hexadecimal values in verbatim string literals with the actual printable characters  For example  it replaces    x07  with   a   or    x0A  with   n   It converts to supported escape characters such as  a   b   e   n   r   f   t   v  and alphanumeric characters    string str     a  b  c   var output   System Text RegularExpressions Regex Unescape str     Reference   https   docs microsoft com en-us dotnet api system text regularexpressions regex unescape view netframework-4 8

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I tried the procedures of your posts but with no success   This is what I get from debugger    Original string that I save into sqlite database was b r na    when I read them  I get b  r  na  length in debugger is 6   b        r        n   a   then I try replace this string and I get string with length 6 again  you can see in picture above    I run this short script in my test form with only one text box   private void Form Load object sender  EventArgs e                string x    b  r  na           string y   x Replace                       this textBox Text   y     r n r nLength      y Length ToString            and I get this in text box  so  no new line characters between  b  and  a    b r na  Length  6   What can I do with this string to unescape backslash   I expect new line between  b  and  a     Solution   OK  this is not possible to do with standard replace  because of  r and  n is one character  Is possible to replace part of string character by character but not possible to replace  half part  of one character  So  I must replace any special character separatelly  like this   private void Form Load object sender  EventArgs e                string z   x Replace    r n   Environment NewLine             This produce correct result for me   b a

User · Answer

Try -   var newstring     a  b  Replace

User · Answer

string a     a  b   a   a Replace                should work  Remember that in the watch Visual STudio show the     escaped so you see     in place of a single one

User · Answer

I suspect your string already actually only contains a single backslash  but you re looking at it in the debugger which is escaping it for you into a form which would be valid as a regular string literal in C    If print it out in the console  or in a message box  does it show with two backslashes or one   If you actually want to replace a double backslash with a single one  it s easy to do so   text   text Replace                     but my guess is that the original doesn t contain a double backslash anyway  If this doesn t help  please give more details   EDIT  In response to the edited question  your stringToBeReplaced only has a single backslash in  Really  Wherever you re seeing two backslashes  that viewer is escaping it  The string itself doesn t have two backslashes  Examine stringToBeReplaced Length and count the characters

User · Answer

in case someone got stuck with this and none of the answers above worked  below is what worked for me   Hope it helps   var oldString      r   n       None of these worked for me    var newString   oldString                  var newString   oldString Replace                   var newString   oldString Replace    u5b89     u5b89       var newString   Regex Replace oldString                     This is what worked var newString   Regex Unescape oldString      newString is now   r  n

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