c# - C# - 如何删除字符串的特定部分？

Question

作为这个问题的延续

假设我有一个字符串：

String myString = "violet are blue|roses are red|this is a terrible poet";

我想修剪它说“玫瑰是红色的|”的特定部分 使它成为：

myString = "violet are blue|this is a terrible poet";

Answer 1

你可以使用String.Replace方法

string input = "violet are blue|roses are red|this is a terrible poet";
string expected = "violet are blue|this is a terrible poet";
string actual = input.Replace("roses are red|", String.Empty);        

Debug.Assert(expected == actual);

Answer 2

我假设|您要使用这些字符来查找要删除的内容。

|使用获取第一个索引IndexOf，然后是第二个，然后使用 获取字符串的其余部分Remove：

int index1 = myString.IndexOf('|');
int index2 = myString.IndexOf('|', index1 + 1);
myString = myString.Remove(index1, index2 - index1);

Answer 3

使用拆分：

const string myString = "violet are blue|roses are red|this is a terrible poet";
const char itemToSplitOn = '|';

var arr = myString.Split(itemToSplitOn);
var newString = arr[0] + itemToSplitOn + arr[2];

Answer 4

如果没有正则表达式的答案，这个问题就不会是一个完整的问题:)

String myString = "violet are blue|roses are red|this is a terrible poet";
var newstr = Regex.Replace(myString, @"\|.+?\|", "|");