[英]Why String.replaceAll() don't work on this String?
//This source is a line read from a file
String src = "23570006,music,**,wu(),1,exam,\"Monday9,10(H2-301)\",1-10,score,";
//This sohuld be from a matcher.group() when Pattern.compile("\".*?\"")
String group = "\"Monday9,10(H2-301)\"";
src = src.replaceAll("\"", "");
group = group.replaceAll("\"", "");
String replacement = group.replaceAll(",", "#@");
System.out.println(src.contains(group));
src = src.replaceAll(group, replacement);
System.out.println(group);
System.out.println(replacement);
System.out.println(src);
I'm trying to replace the ","
between \\"s
so I can use String.split()
latter. 我试图取代
","
与\\"s
这样我就可以使用String.split()
后者。
But the above just not working , the result is: 但以上只是不起作用,结果是:
true
Monday9,10(H2-301)
Monday9#@10(H2-301)
23570006,music,**,wu(),1,exam,Monday9,10(H2-301),1-10,score,
but when I change the src string to 但是当我将src字符串更改为
String src = "123\"9,10\"123";
String group = "\"9,10\"";
It works well 它运作良好
true
9,10
9#@10
1239#@10123
What's the matter with the string??? 字符串有什么问题???
(
and )
are regex metacharacter; (
和)
是正则表达式元字符; they need to be escaped if you want to match it literally. 如果你想要按字面意思匹配它们,它们需要被转义。
String group = "\"Monday9,10\\(H2-301\\)\"";
^ ^
The reason why you need two slashes is that because \\
in a string literal is itself an escape character, so "\\\\"
is a string of length 1 containing a slash. 你需要两个斜杠的原因是因为字符串文字中的
\\
本身就是一个转义字符,所以"\\\\"
是一个长度为1的字符串,包含一个斜杠。
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