regex - Using PHP's preg_match_all to extract a URL -

i have been struggling while make following work. basically, i'd able extract url expression contained in html template, follows:

{rssfeed:url(http://www.example.com/feeds/posts/default)} 

the idea that, when found, url extracted, , rss feed parser used rss , insert here. works, example, if hardcode url in php code, need regex figured out template flexible enough useful in many situations.

i've tried @ least ten different regex expressions, found here on so, none working. regex doesn't need validate url; want find , extract it, , delimiters url don't need parens, either.

thank you!

/\{rssfeed\:url\(([^)]*)\)\}/

preg_match_all('/\{rssfeed\:url\(([^)]*)\)\}/', '{rssfeed:url(http://www.example.com/feeds/posts/default)}', $matches, preg_pattern_order); print_r($matches[1]); 

you should able urls on content available in $matches[1]..

note: urls {rssfeed:url()} format, not urls in content.

you can try here: http://www.spaweditor.com/scripts/regex/index.php