Javascript正则表达式字符串替换多行字符串
[英]Javascript regular expression string-replacement of multi-line strings
问题描述
With JavaScript regular expression replace, trying to replace anything between <head> and </head> tags so that: 
使用JavaScript正则表达式替换，尝试替换<head>和</head>标记之间的任何内容，以便：
<head>
Multiline foo
</head>
<body>
Multi line bar
</body>
gets replaced into: 被替换为：
<body>
Multi line bar
</body>
and trying with the very basic: <head(.*)\\/head>/m which doesn't work. 并尝试使用非常基本的： <head(.*)\\/head>/m ，它不起作用。 It works fine when line breaks are removed from string. 当从字符串中删除换行符时，它工作正常。 No matter what type of line breaks, what's the magic? 无论什么类型的换行，什么是魔术？
2 个解决方案
解决方案1
8 2011-01-19 11:27:07
The problem is that the dot metacharacter doesn't match newlines. 问题是点元字符与换行符不匹配。 In most regex flavors you can force it to match everything by setting "DOTALL" or "single-line" mode, but JavaScript doesn't support that. 在大多数正则表达式中，您可以通过设置“DOTALL”或“单行”模式强制它匹配所有内容，但JavaScript不支持它。 Instead, you have to replace the dot with something that does match everything. 相反，你必须更换的东西， 不匹配任何东西的点。 The most common idiom is [\\s\\S] ("any whitespace character or any character that's not whitespace"). 最常见的习语是[\\s\\S] （“任何空白字符或任何不是空格的字符”）。
解决方案2
4 2011-01-19 11:55:05
Alan is right, to summarize, use /<head([\\s\\S]*)\\/head>/ and it should do what you wish. 总而言之，Alan是对的，使用/<head([\\s\\S]*)\\/head>/它应该按照你的意愿行事。
The actual regex i'd use for the job is /<head>([\\s\\S]*?)<\\/head>/ but the difference probably won't matter, since it just assures there is no greedy matching with a 2nd head tag that should never be there :) 我用于作业的实际正则表达式是/<head>([\\s\\S]*?)<\\/head>/但差异可能无关紧要，因为它只是确保没有贪婪的匹配永远不应该在那里的第二个头标记:)
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