[英]c# Replace text within curly brackets, including the curly brackets
I'm trying to replace a string,enclosed in curly brackets. 我正在尝试替换用大括号括起来的字符串。
If I use the Replace method provided by the Regex class and I don't specify the curly brackets, the string is found and replaced correctly, but if I do specify the curly brackets like this: {{FullName}}
, the text is left untouched. 如果我使用Regex类提供的Replace方法并且未指定大括号,则会找到并正确替换字符串,但是如果我确实指定大括号,例如:
{{FullName}}
,则文本将保留不变。
var pattern = "{{" + keyValue.Key + "}}";
docText = new Regex(pattern, RegexOptions.IgnoreCase).Replace(docText, keyValue.Value);
Take this string as a example 以这个字符串为例
Dear {{FullName}}
I want to replace it with John
, so that the text ends up like this: 我想将其替换为
John
,以使文本最终像这样:
Dear John
. Dear John
。
How can I express the regex, so that the string is found and replace correctly? 如何表达正则表达式,以便找到字符串并正确替换?
You don't need a regular expression if the key is just a string. 如果键只是一个字符串,则不需要正则表达式。 Just replace "{{FullName}}" with "John".
只需将“ {{FullName}}”替换为“ John”即可。 example:
例:
string template = "Dear {{FullName}}";
string result = template.Replace("{{" + keyValue.Key + "}}", keyValue.Value);
Edit: addressing concerns that this doesn't work... 编辑:解决这不起作用的问题...
The following is a complete example. 以下是一个完整的示例。 You can run it at https://dotnetfiddle.net/wnIkvf
您可以在https://dotnetfiddle.net/wnIkvf上运行它
using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
var keyValue = new KeyValuePair<string,string>("FullName", "John");
string docText = "Dear {{FullName}}";
string result = docText.Replace("{{" + keyValue.Key + "}}", keyValue.Value);
Console.WriteLine(result);
}
}
Looking for "Dear {{FullName}}"
to "Dear John"
? 寻找
"Dear {{FullName}}"
到"Dear John"
吗?
not a regex solution... but this is how I prefer to do it sometimes. 不是正则表达式解决方案...但这就是我有时更喜欢这样做的方式。
string s = "Dear {{FullName}}";
// use regex to replace FullName like you mentioned before, then...
s.Replace("{",string.empty);
s.Replace("}",string.empty);
var keyValue = new KeyValuePair<string,string>("FullName", "John");
var pattern = "{{" + keyValue.Key + "}}";
Console.WriteLine(new Regex(Regex.Escape(pattern), RegexOptions.IgnoreCase).Replace("Dear {{FullName}}", keyValue.Value));
Output: 输出:
Dear John
If you actually want to use a regular expression, then escape your literal text to turn it into a regular expression pattern using Regex.Escape . 如果您确实想使用正则表达式,请使用Regex.Escape转义文字文本以将其转换为正则表达式模式。
var keyValue = new KeyValuePair<string,string>("FullName", "John");
string docText = "Dear {{FullName}}";
var pattern = "{{" + keyValue.Key + "}}";
docText = new Regex(Regex.Escape(pattern), RegexOptions.IgnoreCase).Replace(docText, keyValue.Value);
docText will be Dear John
docText将是
Dear John
What I believe is that you really want to do is replace multiple things in a document. 我相信您真正想做的是替换文档中的多个内容。
To do so use the regex pattern I provide, but also use the regex replace match evaluator delegate. 为此,请使用我提供的regex模式,也可以使用regex替换匹配评估程序委托。 What that does, is that every match can be actively evaluated for each item and a proper item will be replaced as per C# logic.
这样做是为了可以针对每个项目主动评估每个匹配项,并根据C#逻辑替换适当的项目。
Here is an example with two possible keywords setup. 这是带有两个可能的关键字设置的示例。
string text = "Dear {{FullName}}, I {{UserName}} am writing to say what a great answer!";
string pattern = @"\{\{(?<Keyword>[^}]+)\}\}";
var replacements
= new Dictionary<string, string>() { { "FullName", "OmegaMan" }, { "UserName", "eddy" } };
Regex.Replace(text, pattern, mt =>
{
return replacements.ContainsKey(mt.Groups["Keyword"].Value)
? replacements[mt.Groups["Keyword"].Value]
: "???";
}
);
Result 结果
Dear OmegaMan, I eddy am writing to say what a great answer!
亲爱的OmegaMan,我正在写涡流,说这是一个很好的答案!
The preceding example uses 前面的示例使用
(?<{Name here}> …)
(?<{Name here}> …)
[^ ]
which says match until the negated item is found, in this case a closing curly }
. [^ ]
表示匹配,直到找到被否定的项为止,在这种情况下为close curl }
。
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