I have a simple question, and I did some research but couldn't find the right answer for it.
I have this string:
|She wants to eat breakfast|
I found the answer for replacing ALL the characters |
with another character.
My idea is that I want to replace the first |
with {
and the last one with }
.
I know this is easy, but I the answer for this question would really help me out.
Thanks in advance.
You can use string.Substring
:
s = "{" + s.Substring(1, s.Length - 2) + "}";
See it working online: ideone
This assumes that the characters you want to replace are the very first and last characters in the string.
If you use .Net 3 and higher and you don't want to use an extension method then you can prefer Lambda for a little bit better performance than normal string operations..
string s = "|she wants to eat breakfast|";
s.Replace(s.ToCharArray().First(ch => ch == '|'), '{'); //this replaces the first '|' char
s.Replace(s.ToCharArray().Last(ch => ch == '|'), '}'); // this replaces the last '|' char
string oldString = "|She wants to eat breakfast|";
string newString = "{" + oldString.SubString(1,oldString.Length-2) + "}";
or using string.Concat (the internal implementation of + operator for strings calls string.Concat)
string newString = string.Concat("{",oldString.SubString(1,oldString.Length-2),"}");
The fastest way to go would be this:
var str = "|She wants to eat breakfast|";
unsafe
{
fixed (char* pt = str)
{
pt[0] = '{';
pt[str.Length - 1] = '}';
}
}
Console.WriteLine(str); // Prints: {She wants to eat breakfast}
You will need to enable unsafe code (Right-click project > properties > build > "Allow unsafe code".
This is about 19 times faster than using Substring and adding bracelets at the edges.
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