Do less than and greater than need escaped in a C# regex?
Question
Do < and > need escaped in a C# regex? I'm uncertain because of named groups and because this regex cheat sheet has them listed in the metacharacters section.
html = Regex.Replace(html, "(<body.*?>)", replacement);
or
html = Regex.Replace(html, "(\<body.*?\>)", replacement);
3 answers
solution1
9 ACCPTED 2013-07-09 13:17:27
It is never necessary to escape < or > in regexen. The only context in which they have a special meaning is if the < comes after (? . And since regular characters aren't allowed directly after (? escaping the < there would make no sense (ie (?\\<blabla\\>) would be ill-formed).
If you want to match the literal sequence ?<bla> , you'd need to escape the ? , not the < and in all other cases < and > have no special meaning.
solution2
1 2013-07-09 12:55:55
In this expression they will not need escaped because they are not wrapped around a word . If your expression was something more like (?<body>.*?) then what it would do is capture .*? and name it body .
solution3
0 2013-07-09 12:58:25
在这种情况下，它并不是绝对必要的，但是如果你确实逃避了，你肯定清楚你的意思，而当你在6个月后审查你的代码或者其他人阅读它时，逃避可能会引起对意义的怀疑。
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