recognize and replace links in yahoo pipes with regex

would there be a formula to recognize any link out of rss feeds an开发者_开发问答d replace them with a fix value with regex in yahoo pipes?

Sure! there is a pipe for this!

Just have a quick look up on Autodiscovery mode http://pipes.yahoo.com/pipes/docs?doc=sources#FeedAutoDiscovery

By looking inside this module you have a regex treatment to recognise any other url in the page