C# 执行 Regex.Replace() 时如何使用命名组
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12962114/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to use named groups when performing a Regex.Replace()
提问by Johan Larsson
How do I use named captures when performing Regex.Replace? I have gotten this far and it does what I want but not in the way I want it:
执行 Regex.Replace 时如何使用命名捕获？我已经走了这么远，它做了我想要的但不是我想要的方式：
[TestCase("First Second", "Second First")]
public void NumberedReplaceTest(string input, string expected)
{
Regex regex = new Regex("(?<firstMatch>First) (?<secondMatch>Second)");
Assert.IsTrue(regex.IsMatch(input));
string replace = regex.Replace(input, " ");
Assert.AreEqual(expected, replace);
}
I want to match the two words with named captures and then use the (named) captures when performing the replace.
我想将这两个词与命名捕获匹配，然后在执行替换时使用（命名）捕获。
采纳答案by Kendall Frey
Instead of "$2 $1", you can use "${secondMatch} ${firstMatch}".
相反"$2 $1"，您可以使用"${secondMatch} ${firstMatch}".
There is a list of all the replacements you can do here.
此处列出了您可以执行的所有替换操作。
Here is an abbreviated list:
这是一个简短的列表：
$number- The captured group by number.
$number- 按编号捕获的组。
${name}- The captured group by name.
${name}- 按名称捕获的组。
$$- $ literal.
$$- $ 字面量。
$&- Entire match.
$&- 整个比赛。
$`- The input string before the match.
$`- 匹配前的输入字符串。
$'- The input string after the match.
$'- 匹配后的输入字符串。
$+- The last group captured.
$+- 捕获的最后一组。
$_- The entire input string.
$_- 整个输入字符串。
回答by CaffGeek
Simply replace with ${groupName}
简单地替换为 ${groupName}
[TestCase("First Second", "Second First")]
public void NumberedReplaceTest(string input, string expected)
{
Regex regex = new Regex("(?<firstMatch>First) (?<secondMatch>Second)");
Assert.IsTrue(regex.IsMatch(input));
string replace = regex.Replace(input, "${secondMatch} ${firstMatch}");
Assert.AreEqual(expected, replace);
}
