How can i declare ^\ in a string or character - c#

I would like to declare ^\ this as a string or character. I used the below but i am getting an error
string str="^\";
So can any one help me


You have to escape the backslash.
string str = "^\\";
Or, you can use the verbatim syntax.
string str = #"^\";


\ is the escape token, you have to double it to use it as a literal in a string:
string str = "^\\";
Alternatively, you can use literal string syntax:
string str = #"^\";


You need to escape backslash characters, so instead of:
string str = "^\";
use:
string str = "^\\";


I have no idea about C#, but can you try:
string str="^\\";

Related

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="\",\"";

How to remove a combination of characters from a string?

For Example, I am having a string like:
string str = "santhosh,ravi,phani,praveen,sathish,prakash";
Now , I need to remove ,phani from str.
can any one help me?
I tried by using trim and substring.but I am not getting that.

Try the following,
str = str.Replace(",phani", string.Empty);

You can use String.Replace() method for that;
Returns a new string in which all occurrences of a specified Unicode
character or String in the current string are replaced with another
specified Unicode character or String.
string str = "santhosh,ravi,phani,praveen,sathish,prakash";
str = str.Replace(",phani", "");
Console.WriteLine(str);
Here is a DEMO.

Why doesn't my code compile?

I am using regular expression in code behind file and defining string as
string ValEmail = "\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*";
if (Regex.IsMatch(email, "\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*"))
{ }
else
{ }
It gives me warning and does not compile. How can I define such string combination?.

In C# the backslash is a special character, if it is to represent a backslash we need to inform the compiler as such.
This can be achieved by escaping it with a backslash:
string ValEmail = "\\w+([-+.']\\w+)*#\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";
Or using an # prefix when constructing the string:
string ValEmail = #"\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*";

The backslash is the escape char in c# strings. Technically you have to escape the backslash with another blackslash ("\\") or just add an # before your string:
string ValEmail = #"\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*";

Use #"\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*" so the backslashes will get escaped

Problem with String Verbatim

I use C#.
I need assign a value to a string as verbatim.
Here my code:
string verbatim = "#<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">";
or
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";
But it does not work.
What I'm doing wrong here? Thanks

You mean a verbatim string literal? Double-up the internal quotes and move the #:
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";

The # charctaer goes outside the string ath beginning and you need to escape your quotes, i.e.
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">"

The # must be outside the string and you need to use double quotes:
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";

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('"','\'');

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