不匹配BBCode标记之间的URL

Question

As the title says I want my pattern to match the URL's in the string, except the ones that are between the BBCode tags.

So far I have made a pattern that doesn't match the URL's between the [img] tags, but have no enough regex skills to make it work for all tags like the more advanced onces ([url=xxx]yyy[/url] and such). So to be clear: nothing between [ and ] should match.

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Here is my working example to not match the URL's between the [img] tag:

http://regexr.com/v1?38mae (may have to paste the below pattern due to encoding being messed up)

Pattern:

(?<!\[img])(((http|ftp|https):\/\/)|www\.)[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#!]*[\w\-\@?^=%&/~\+#])

I'd appreciate any kind of help!

Answer 1

You can add this at the begining of your pattern:

\[[^]]*](*SKIP)(*FAIL)|

This subpattern will find all that is between square brackets, make the pattern fail and force to not retry the substring.

Example with your pattern (with ~ as delimiter):

$pattern = '~\[[^]]*](*SKIP)(*FAIL)|
             (?<!\[img])
             (?:(?:ht|f)tps?://|www\.)
             [\w-]+
             (?:\.[\w-]+)+
             [\w-.,@?^=%&:/\~+#!]*[\w-@?^=%&/\~+#]~xiu';