Develop Reference

Delete string from a double in C#

I am sending data from arduino to c# and have a problem. The value I get from the serialread comes with an "\r" at the end of it, example: "19.42\r". I found a solution to delete the characters after my number by using Regex. But it also makes my double an integer. "19.42\r" becomes "1942". How can I delete my string but still keep the value as a double?
line = Regex.Replace(line, #"[^\d]", string.Empty);

You want to trim the whitespace from the end of the string.
Use
line = line.TrimEnd();
See the C# demo
If you need to actually extract a double number from a string with regex, use
var my_number = string.Empty;
var match = Regex.Match(line, #"[0-9]+\.[0-9]+");
if (match.Success)
{
my_number = match.Value;
}
If the number can have no fractional part, use #"[0-9]*\.?[0-9]+" regex.

string data = "19.42\r";
return data.Substring(0, data.Length - 1);
or even better
data.TrimEnd('\r')

if \r is fixed characters you want to remove
string str = "awdawdaw\r";
str = str.replace("\r","");
if \r is not fixed characters you want to remove
string str = "awdawdaw\\";
str = str.Substring((str.Length - 2), 2); \\will be removed

Regex replace special characters defind by client

I need a c# function which will replace all special characters customized by the client from a string Example
string value1 = #"‹¥ó׬¶ÝÆ";
string input1 = #"Thi¥s is\123a strÆing";
string output1 = Regex.Replace(input1, value1, "");
I want have a result like this : output1 =Thi s is\123a str ing

Why do you need regex? This is more efficient, concise also readable:
string result = string.Concat(input1.Except(value1));
If you don't want to remove but replace them with a different string you can still use a similar(but not as efficient) approach:
string replacement = "[foo]";
var newChars = input1.SelectMany(c => value1.Contains(c) ? replacement : c.ToString());
string result = string.Concat( newChars ); // Thi[foo]s is\123a str[foo]ing

Someone asked for a regex?
string value1 = #"^\-[]‹¥ó׬¶ÝÆ";
string input1 = #"T-^\hi¥s is\123a strÆing";
// Handles ]^-\ by escaping them
string value1b = Regex.Replace(value1, #"([\]\^\-\\])", #"\$1");
// Creates a [...] regex and uses it
string input1b = Regex.Replace(input1, "[" + value1b + "]", " ");
The basic idea is to use a [...] regex. But first you have to escape some characters that have special meaning inside a [...]. They should be ]^-\ Note that you don't need to escape the [
note that this solution isn't compatible with non-BMP unicode characters (characters that fill-up two char)
A solution that is compatible with them is more complex, but for normal use it shouldn't be a problem.

To remove double quotes in string array

In the below code i have a string array which holds values like "1,2,3" i want to remove the double quotes and display as 1,2,3.pls help me to do this.
string[] Stocks = StockDetails.ToArray();
string s = string.Join(",", Stocks);

You can just use string.Replace
var listOfStrings = StockDetails.Select(s => s.Replace("\"", string.Empty))
.ToList();

If you're having string in this format
string str = "\"1,2,3\"";
..then you can simply remove the double quotation marks using Replace method on string.
str = str.Replace("\"", "");
..this will replace the double quotation from your string, and will return the simple text that is not a double quotes.
More I don't think strings are like this, you're having a look at the actual value of the variable string you're having. When you will use it, it will give you the actual 1, 2, 3 but however, use the above code to remove the quotation .

How do I make a string of ","?

I tried:
string endtag = "\"","\"";
But that's not working. The string should be: ","
The " is also part of the string not only the ,

Try this:
string endtag = "\",\"";
To explain, the first " begins a string literal, the \" is an escape sequence for a " character, the , is a regular character, again, the \" is an escape sequence for a " character, then the final " closes the string literal.
You could also use a verbatim literal like this:
string endtag = #""",""";
Here the first " begins a string literal, and the # preceding it introduces it as a verbatim string literal. The next two "" are a special escape sequence for a " character within a verbatim string literal, the , is a regular character, again, next two "" are a special escape sequence for a " character, then the final " closes the string literal.

try string endtag = "\",\""; Alternatively you could try string endtag = #""","""; Hope that helps.

Another option:
string endtag = #""",""";
#"..." is a verbatim string literal
To use a " in this literal, it is doubled

Like so:
string endtag = "\",\"";

Try this :
String endtag = "\"" , "\"";

" is an escape sequence character.
If you want to put " in your string, you should use \" like this:
string endtag = "\",\"";
Or you can define verbatim string literal using double double quotation marks ("") like;
string endtag = #""",""";

This will work:
string endtag="\",\"";

string replace single quote to double quote in C#

How can I replace a single quote (') with a double quote (") in a string in C#?

You need to use the correct escape sequence for the quotes symbol, you can find more information about escape sequencies here.
String stringWithSingleQuotes= "src='http://...';";
String withDoubleQuotes = stringWithSingleQuotes.Replace("'","\"");

var abc = "hello the're";
abc = abc.Replace("'","\"");

string str;
str=strtext.Replace('"','\'');