java 替换标签内的字符串？
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Replace string inside tags?
提问by membersound
I want to replace a content inside some tags, eg:
我想替换一些标签内的内容，例如：
<p>this it to be replaced</p>
I could extract the content between with groups like this, but can i actually replace the group?
我可以像这样提取组之间的内容，但我实际上可以替换组吗？
str = str.replaceAll("<p>([^<]*)</p>", "replacement");
采纳答案by Bohemian
Change the regex to this:
将正则表达式更改为：
(?<=<p>).*?(?=</p>)
ie
IE
str = str.replaceAll("(?<=<p>).*?(?=</p>)", "replacement");
This uses a "look behind" and a "look ahead" to assert, but not capture, input before/after the matching (non-greedy) regex
这使用“后视”和“前视”来断言但不捕获匹配（非贪婪）正则表达式之前/之后的输入
Just in case anyone is wondering, this answer is different to dacwe's: His uses unnecessary brackets. This answer is the more elegant :)
以防万一有人想知道，这个答案与 dacwe 的不同：他使用了不必要的括号。这个答案更优雅:)
回答by dacwe
You can use lookaround(positive lookahead and lookbehind) for this:
您可以为此使用环视（正向前瞻和后视）：
Change the regex to: "(?<=<p>)(.*?)(?=</p>)"and you will be fine.
将正则表达式更改为："(?<=<p>)(.*?)(?=</p>)"你会没事的。
Example:
例子：
String str = "<p>this it to be replaced</p>";
System.out.println(str.replaceAll("(?<=<p>)(.*?)(?=</p>)", "replacement"));
Output:
输出：
<p>replacement</p>
Note however that if you are parsing HTML you should be using some kind of a HTML parser, often regular expressions is not good enough...
但是请注意，如果您正在解析 HTML，您应该使用某种 HTML 解析器，通常正则表达式不够好......
