c# - 如何替换字符串中的单词

Question

这是一个非常基本的问题，但我不确定为什么它不起作用。我有代码，其中“和”可以用“和”、“和”等任何方式编写，我想用“，”替换它

我试过这个：

and.Replace("and".ToUpper(),",");

但这不起作用，还有其他方法可以做到这一点或使它起作用吗？

Answer 1

你应该看看 Regex 类

http://msdn.microsoft.com/en-us/library/xwewhkd1.aspx

using System.Text.RegularExpressions;

Regex re = new Regex("\band\b", RegexOptions.IgnoreCase);

string and = "This is my input string with and string in between.";

re.Replace(and, ",");

Answer 2

我想你应该小心一些词是否包含and，说"this is sand and sea"。“沙子”这个词一定不能受到替换的影响。

string and = "this is sand and sea";

//here you should probably add those delimiters that may occur near your "and"
//this substitution is not universal and will omit smth like this " and, " 
string[] delimiters = new string[] { " " }; 

//it result in: "this is sand , sea"
and = string.Join(" ", 
                  and.Split(delimiters,  
                            StringSplitOptions.RemoveEmptyEntries)
                     .Select(s => s.Length == 3 && s.ToUpper().Equals("AND") 
                                     ? "," 
                                     : s));

我也会像这样添加：

and = and.Replace(" , ", ", ");

所以，输出：

this is sand, sea

Answer 3

words = words.Replace("AND", ",")
             .Replace("and", ",");

或者使用正则表达式。

Answer 4

该Replace方法返回一个替换可见的字符串。它不会修改原始字符串。你应该尝试一些类似的东西

and = and.Replace("and",",");

您可以为您可能遇到的所有“和”变体执行此操作，或者正如其他答案所建议的那样，您可以使用正则表达式。

Answer 5

尝试这种方式使用静态Regex.Replace()方法：

and = System.Text.RegularExpressions.Regex.Replace(and,"(?i)and",",");

"(?i)" 导致以下文本搜索不区分大小写。

http://msdn.microsoft.com/en-us/library/yd1hzczs.aspx

http://msdn.microsoft.com/en-us/library/xwewhkd1(v=vs.100).aspx