我希望在两个命名捕获组之间的特定位置插入美元符号。问题是这意味着替换字符串中有两个紧接着的美元符号,这会导致问题。
我该如何直接使用Replace方法来实现?我只找到了通过添加一些临时垃圾并立即删除的解决方法。
请参见以下代码以了解问题:
// We want to add a dollar sign before a number and use named groups for capturing;
// varying parts of the strings are in brackets []
// [somebody] has [some-dollar-amount] in his [something]
string joeHas = "Joe has 500 in his wallet.";
string jackHas = "Jack has 500 in his pocket.";
string jimHas = "Jim has 740 in his bag.";
string jasonHas = "Jason has 900 in his car.";
Regex dollarInsertion = new Regex(@"(?<start>^.*? has )(?<end>\d+ in his .*?$)", RegexOptions.Multiline);
Console.WriteLine(joeHas);
Console.WriteLine(jackHas);
Console.WriteLine(jimHas);
Console.WriteLine(jasonHas);
Console.WriteLine("--------------------------");
joeHas = dollarInsertion.Replace(joeHas, @"${start}$${end}");
jackHas = dollarInsertion.Replace(jackHas, @"${start}$-${end}");
jimHas = dollarInsertion.Replace(jimHas, @"${start}\$${end}");
jasonHas = dollarInsertion.Replace(jasonHas, @"${start}$kkkkkk----kkkk${end}").Replace("kkkkkk----kkkk", "");
Console.WriteLine(joeHas);
Console.WriteLine(jackHas);
Console.WriteLine(jimHas);
Console.WriteLine(jasonHas);
Output:
Joe has 500 in his wallet.
Jack has 500 in his pocket.
Jim has 740 in his bag.
Jason has 900 in his car.
--------------------------
Joe has ${end}
Jack has $-500 in his pocket.
Jim has \${end}
Jason has $900 in his car.