Javascript regular expression string-replacement of multi-line strings
Question
With JavaScript regular expression replace, trying to replace anything between <head> and </head> tags so that:
<head>
Multiline foo
</head>
<body>
Multi line bar
</body>
gets replaced into:
<body>
Multi line bar
</body>
and trying with the very basic: <head(.*)\\/head>/m which doesn't work. It works fine when line breaks are removed from string. No matter what type of line breaks, what's the magic?
2 answers
solution1
8 2011-01-19 11:27:07
The problem is that the dot metacharacter doesn't match newlines. In most regex flavors you can force it to match everything by setting "DOTALL" or "single-line" mode, but JavaScript doesn't support that. Instead, you have to replace the dot with something that does match everything. The most common idiom is [\\s\\S] ("any whitespace character or any character that's not whitespace").
solution2
4 2011-01-19 11:55:05
Alan is right, to summarize, use /<head([\\s\\S]*)\\/head>/ and it should do what you wish.
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 :)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.