问题
Possible Duplicates:
RegEx match open tags except XHTML self-contained tags
.NET Regex balancing groups expression - matching when not balanced
For example, if I had the input:
[quote]He said:
[quote]I have no idea![/quote]
But I disagree![/quote]
And another quote:
[quote]Some other quote here.[/quote]
How can I effectively grab blocks of quotes using regular expressions without grabbing too much or too little? For example, if I use:
\[Quote\](.+)\[/Quote\]
This will grab too much (basically, the entire thing), whereas this:
\[Quote\](.+?)\[/Quote\]
will grab too little (it will only grab [quote]He said:[quote]I have no idea![/quote], with mismatching start/end braces).
So how can I effectively parse nested blocks of code like this using Regex?
回答1:
Regexes and nesting do not work well toghether. It's possible (but, depending on the regex dialect you're using, potentially very cumbersome) to construct a regex that matches only an innermost pair. However, if you want to match an entire quote with nested quotes inside, then regular expressions are simply not a strong enough tool. You'll need to look into context-free parser technology, or do successive replaces to rewrite the nested quotes to something else before matching the outer ones.
回答2:
Take a look at my xml indenter, it uses groups to match beginning tag to the last tag, and another group to get the content recursively.
来源：https://stackoverflow.com/questions/7151468/how-can-i-parse-nested-blocks-using-regex