是否有不区分大小写的 string.Replace 替代方案? [英] Is there an alternative to string.Replace that is case-insensitive?

问题描述

我需要搜索一个字符串并将所有出现的 %FirstName% 和 %PolicyAmount% 替换为从数据库中提取的值.问题是 FirstName 的大小写不同.这阻止了我使用 String.Replace() 方法.我已经看到有关该主题的网页建议

I need to search a string and replace all occurrences 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);

然而，由于某种原因，当我尝试用 $0 替换 %PolicyAmount% 时，替换从未发生.我认为这与美元符号是正则表达式中的保留字符有关.

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.

我可以使用另一种方法来处理输入以处理正则表达式特殊字符吗?

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

推荐答案

来自 MSDN
$0 - 替换与组号(十进制)匹配的最后一个子字符串."

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

在 .NET 正则表达式中，组 0 始终是整个匹配项.对于文字 $，您需要

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);

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