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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(176, 36%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHE%3C/text%3E%3C/svg%3E)
Hello All. In my app I have a regex pattern that I accept from the user as a string. if the user enter this string pattern " " " and I check in the debugger I see that visual studio replace it to " \" ". Please how I can fix that.
To view the real string, go to Watch or Immediate windows, and enter this expression: s,nq, where s is your string variable.
Hello Viorel and thank you.
To be more clear.
I as a user enter "a"b" as a string pattern in field input.
I as a programmer have this code.
When I run in debug mode and step to GetPattern method that read
the user string pattern and then I hover the cursor on the pattern variable
I see "a"b" as in image 1 instead "a"b" as in image 2
private async void MatchButton_Clicked(object sender, EventArgs e)
{
GetPattern();
try
{
Regex.Match("", pattern);
}
catch
{
//
}
In Visual Studio, Image 1 displays the value according to C# language rules. Image 2 shows the real content without special characters.
Image 1 when cursor hover on pattern variable
Image 2 when click the above view and select text visualize
Sory the site remove the \" from "a\"b".
the images show what I see in VS. and also as the code validate the
pattern "a"b" to true witch is not true in regex. Please any hint Thank you
"In Visual Studio, Image 1 displays the value according to C# language rules. Image 2 shows the real content without special characters" <== YES
======= The user enter " " " and the pattern variable contain " \"" this why the regex validation is correct. why the input " become \" ???
This is the full code Please what is wrong.
string? pattern = "";
private string re_str = @"^\s*""(.*)""\s*.*$";
//pattern_string is user string input
private bool GetPattern(String pattern_string)
{
StringWriter swArrayToString = new StringWriter();
string cleanPattern;
int i;
pattern = "";
pattern_correct = true;
string gstr = Regex.Match(pattern_string), re_str).Groups[1].Value;
if(gstr != "")
{
cleanPattern = Regex.Replace(RERichTextBoxLines[i], re_str, gstr);
swArrayToString.Write(cleanPattern);
}
pattern = swArrayToString.ToString();
if(String.IsNullOrEmpty(pattern))
{
return (false);
}
swArrayToString.Close();
return (true);
}
private async void MatchButton_Clicked(object sender, EventArgs e)
{
GetPattern(user_string_input);
try
{
Regex.Match("", pattern);
}
catch
{
// pattern not valid
}
}
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(249.60000000000002, 10%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAX%3C/text%3E%3C/svg%3E)
Hello, I will close it as a duplicate ticket:
https://learn.microsoft.com/en-us/answers/questions/1661001/c-regex-pattern-double-quotes-problem