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This regex will find an URL within an HTML A HREF tag. The basic regex we found on regexlib.com but we had to slightly modify it to allow German umlaute as well:
(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:\/~\+#äöüÄÖÜ]*[\w\-\@?^=%&\/~\+#])?