Java：String.replace(regex, string) 从 XML 中删除内容
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Java: String.replace(regex, string) to remove content from XML
提问by TookTheRook
Lets say I have an XML in the form of a string. I wish to remove the content between two tags within the XML String, say . I have tried:
假设我有一个字符串形式的 XML。我希望删除 XML 字符串中两个标签之间的内容，比如 . 我努力了：
String newString = oldString.replaceFirst("\<tagName>.*?\<//tagName>",
"Content Removed");
but it does not work. Any pointers as to what am I doing wrong?
但它不起作用。关于我做错了什么的任何指示？
回答by Sean Patrick Floyd
OK, apart from the obvious answer (don't parse XML with regex), maybe we can fix this:
好的，除了显而易见的答案（不要用正则表达式解析 XML），也许我们可以解决这个问题：
String newString = oldString.replaceFirst("(?s)<tagName[^>]*>.*?</tagName>",
"Content Removed");
Explanation:
解释：
(?s) # turn single-line mode on (otherwise '.' won't match '\n')
<tagName # remove unnecessary (and perhaps erroneous) escapes
[^>]* # allow optional attributes
>.*?</tagName>
Are you sure your matching the tag case correctly? Perhaps you also want to add the iflag to the pattern: (?si)
您确定您的标签大小写正确吗？也许您还想将i标志添加到模式中：(?si)
回答by Pablo Fernandez
Probably the problem lies here:
问题大概出在这里：
<//tagName>
<//tagName>
Try changing it to
尝试将其更改为
<\/tagName>
<\/tagName>
回答by SJuan76
XML is a grammar; regular expressions are not the best tools to work with grammars.
XML 是一种语法；正则表达式不是处理语法的最佳工具。
My advice would be working with a real parser to work with the DOM instead of doing matches
我的建议是使用真正的解析器来处理 DOM 而不是进行匹配
For example, if you have:
例如，如果您有：
<xml>
<items>
<myItem>
<tagtoRemove>something1</tagToRemove>
</myItem>
<myItem>
<tagtoRemove>something2</tagToRemove>
</myItem>
</items>
A regex could try to match it (due to the greedy mechanism)
正则表达式可以尝试匹配它（由于贪婪机制）
<xml>
<items>
<myItem>
matchString
</myItem>
</items>
Also, some uses that some DTDs may allow (such as <tagToRemove/>or <tagToRemove attr="value">) make catching tags with regex more difficult.
此外，某些 DTD 可能允许的某些用途（例如<tagToRemove/>或<tagToRemove attr="value">）使使用正则表达式捕获标签变得更加困难。
Unless it is very clear to you that none of the above may occur (nor or in the future) I would go with a parser.
除非您很清楚上述情况都不会发生（也不会发生），否则我会使用解析器。
