我需要搜索的字符串和替换％名字％和％PolicyAmount％中所有出现一个值从数据库中抽取。问题是名字的大小写不同而不同。这$ P $使用该与string.replace（）方法pvents我。我已经看到了关于这个问题的web页面提示

I need to search a string and replace all occurances of %FirstName% and %PolicyAmount% with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the String.Replace() method. I've seen web pages on the subject that suggest

Regex.Replace(strInput, strToken, strReplaceWith, RegexOptions.IgnoreCase);

不过，对于当我尝试用 $ 1,0 替换％PolicyAmount％某些原因，更换从未发生。我认为它是与美元符号是在正则表达式保留字符。

However for some reason when I try and replace %PolicyAmount% with $0, the replacement never takes place. I assume that it has something to do with the dollar sign being a reserved character in regex.

有另一种方法，我可以使用，不涉及消毒的输入，处理正则表达式的特殊字符？

Is there another method I can use that doesn't involve sanitizing the input to deal with regex special characters?

推荐答案

从MSDN $ 0 - 替代匹配的组号编号（十进制）的最后一个子

From MSDN $0 - "Substitutes the last substring matched by group number number (decimal)."

在.NET正EX pressions组0总是整场比赛。对于文字$需要

In .NET Regular expressions group 0 is always the entire match. For a literal $ you need to

string value = Regex.Replace("%PolicyAmount%", "%PolicyAmount%", @"$$0", RegexOptions.IgnoreCase);