C# 如何使用正则表达式进行不区分大小写的字符串替换？
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How do you do case-insensitive string replacement using regular expressions?
提问by Josh Kodroff
I know precisely zilch about regular expressions and figured this was as good an opportunity as any to learn at least the most basic of basics.
我对正则表达式非常了解，并认为这是学习至少最基本的基础知识的好机会。
How do I do this case-insensitive string replacement in C# using a regular expression?
如何使用正则表达式在 C# 中进行这种不区分大小写的字符串替换？
myString.Replace("/kg", "").Replace("/KG", "");
(Note that the '/' is a literal.)
（请注意，“/”是文字。）
采纳答案by Jon Skeet
You can use:
您可以使用：
myString = Regex.Replace(myString, "/kg", "", RegexOptions.IgnoreCase);
If you're going to do this a lot of times, you could do:
如果你要这样做很多次，你可以这样做：
// You can reuse this object
Regex regex = new Regex("/kg", RegexOptions.IgnoreCase);
myString = regex.Replace(myString, "");
Using (?i:/kg)would make just that bitof a larger regular expression case insensitive - personally I prefer to use RegexOptionsto make an option affect the whole pattern.
使用(?i:/kg)将使这一点位较大的正则表达式不区分大小写的-我个人更喜欢使用RegexOptions作出的选择会影响整个格局。
MSDN has pretty reasonable documentationof .NET regular expressions.
回答by Philippe Leybaert
It depends what you want to achieve. I assume you want to remove a sequence of characters after a slash?
这取决于您想要实现的目标。我假设您想在斜杠后删除一系列字符？
string replaced = Regex.Replace(input,"/[a-zA-Z]+","");
or
或者
string replaced = Regex.Replace(input,"/[a-z]+","",RegexOptions.IgnoreCase);
回答by tom.dietrich
"/[kK][gG]" or "(?i:/kg)" will match for you.
"/[kK][gG]" 或 "(?i:/kg)" 将为您匹配。
declare a new regex object, passing in one of those as your contents. Then run regex.replace.
声明一个新的正则表达式对象，将其中一个作为您的内容传递。然后运行regex.replace。
回答by Tim Hoolihan
Regex regex = new Regex(@"/kg", RegexOptions.IgnoreCase );
regex.Replace(input, "");
回答by Guffa
Like this:
像这样：
myString = Regex.Replace(myString, "/[Kk][Gg]", String.Empty);
Note that it will also handle the combinations /kG and /Kg, so it does more than your string replacement example.
请注意，它还将处理 /kG 和 /Kg 的组合，因此它比您的字符串替换示例做得更多。
If you only want to handle the specific combinations /kg and /KG:
如果您只想处理特定的组合 /kg 和 /KG：
myString = Regex.Replace(myString, "/(?:kg|KG)", String.Empty);
