正则表达式BBCode到HTML [英] Regex BBCode to HTML
问题描述
我将BBcode转换器编写为html.
转换器应跳过未关闭的标签.
I writing BBcode converter to html.
Converter should skip unclosed tags.
我考虑过两种选择:
1)使用一个正则表达式调用一次匹配所有标签，例如:
I thought about 2 options to do it:
1) match all tags in once using one regex call, like:
Regex re2 = new Regex(@"\[(\ /?(?:b|i|u|quote|strike))\]");
MatchCollection mc = re2.Matches(sourcestring);
然后，使用2个指针在MatchCollection上循环查找开始和打开标记，然后用正确的html标记替换.
and then, loop over MatchCollection using 2 pointers to find start and open tags and than replacing with right html tag.
2)为每个标签多次调用正则表达式并直接替换:
2) call regex multiple time for every tag and replace directly:
Regex re = new Regex(@"\[b\](.*?)\[\/b\]");
string s1 = re.Replace(sourcestring2,"<b>$1</b>");
什么是更有效的?
第一个选项使用一个正则表达式，但将要求我遍历所有标签并查找所有对，并跳过没有对的标签.
另一个好处是，我不在乎标签之间的内容，我只是工作并使用位置替换它们.
The first option uses one regex but will require me to loop through all tags and find all pairs, and skip tags that don't have a pair.
Another positive thins is that I don't care about the content between the tags, i just work and replace them using the position.
在第二个选项中，我不必担心循环和进行特殊的替换功能.
但是将需要执行多个正则表达式并替换.
In second option I don't need to worry about looping and making special replace function.
But will require to execute multiple regex and replaces.
您有什么建议?
如果第二个选项是正确的，
正则表达式有问题
\[b\](.*?)\[\/b\]
If the second option is the right one,
there is a problem with regex
\[b\](.*?)\[\/b\]
我如何解决它以匹配多行，如:
how can i fix it to also match multi lines like:
[b]
test 1
[/b]
[b]
test 2
[/b]
推荐答案
一种选择是使用更多类似于SAX的解析，而不是查找特定的正则表达式，而是查找[，然后由程序处理即使以某种方式，也要查找]，甚至还要处理它.等等.尽管比正则表达式更冗长，但可能更易于理解，并且不一定会更慢.
One option would be to use more SAX-like parsing, where instead of looking for a particular regex you look for [, then have your program handle that even in some manner, look for the ], handle that even, etc. Although more verbose than the regex it may be easier to understand, and wouldn't necessarily be slower.
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