Ok. The most perfect expression, ignores whitespace, text and other characters at the end of the line.
https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}([-a-zA-Z0
-9()@:%_\+.~#?&//=]*)
http://www.w3.org/1999/xhtml you're
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