全部替换 ”？” 和 ”\\？” 在 Java 中
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Replace all "?" with "\\?" in Java
提问by GuiceU
is it possible to replace all the questionmarks ("?") with "\?" ?
是否可以将所有问号（“？”）替换为“\？” ?
Lets say I have a String, and I want to delete some parts of that String, one part with an URL in it. Like this:
假设我有一个字符串，我想删除该字符串的某些部分，其中一部分包含 URL。像这样：
String longstring = "..."; //This is the long String
String replacestring = "http://test.com/awesomeness.asp?page=27";
longstring.replaceAll(replacestring, "");
But! As I understand it you can't use the replaceAll() method with a String that contains one single questionmark, you have to make them like this "\?" first.
但！据我了解，您不能将 replaceAll() 方法与包含一个问号的字符串一起使用，您必须使它们像这样“\？” 第一的。
So the question is; Is there some way to replace questionmarks with "\?" in a String? And no, I'm able to just change the String.
所以问题是；有没有办法用“\”替换问号？在字符串中？不，我只能更改字符串。
Thanks in advance, hope someone understands me! (Sorry for bad English...)
在此先感谢，希望有人理解我！（抱歉英语不好...）
回答by Bohemian
Don't use replaceAll(), use replace()!
不要用replaceAll()，用replace()！
It is a common misconception that replaceAll()replaces alloccurrences and replace()just replaces one or something. This is totally incorrect.
这是一种常见的误解，它会replaceAll()替换所有出现的事件，而replace()只是替换一个或某事。这是完全不正确的。
replaceAll()is poorly named - it actually replaces a regex.replace()replaces simple Strings, which is what you want.
replaceAll()名字不好 - 它实际上取代了regex。replace()替换简单的字符串，这正是您想要的。
Both methods replace alloccurrences of the target.
这两种方法都会替换所有出现的目标。
Just do this:
只需这样做：
longstring = longstring.replace(replacestring, "");
And it will all work.
这一切都会奏效。
回答by PearsonArtPhoto
Escape the \too, using \\\\?.
逃离\过，使用\\\\?。
String longstring = "..."; //This is the long String
String replacestring = "http://test.com/awesomeness.asp?page=27";
longstring=longstring.replaceAll(replacestring, "\\?");
But as other answer have mentioned, replaceAllis a bit overkill, just a replaceshould work.
但正如其他答案所提到的，replaceAll有点矫枉过正，只是replace应该工作。
回答by arshajii
replaceAlltakes a regular expression, and ?has a special meaning in the regex world.
replaceAll采用正则表达式，?在正则表达式世界中具有特殊意义。
You should use replacein this case, since you don't need a regex.
您应该replace在这种情况下使用，因为您不需要正则表达式。
String longstring = "..."; //This is the long String
String replacestring = "http://test.com/awesomeness.asp?page=27";
longstring = longstring.replace(replacestring, "");
Oh, and strings are immutable!! longstring = longstring.replace(..), notice the assignment.
哦，字符串是不可变的！！longstring = longstring.replace(..)，注意分配。
回答by Eng.Fouad
Use String.replace()instead of String.replaceAll():
使用String.replace()代替String.replaceAll()：
longstring = longstring.replace("?", "\?");
String.replaceAll()uses Regular Expression, while String.replace()uses plain text.
String.replaceAll()使用正则表达式，而String.replace()使用纯文本。
