URI will not do the trick, since it accepts both absolute and relative URIs, and it doesn't do validation.

For example, "www.example.com" is accepted (even though it's not a valid absolute URI), ":80" and "http://:80" are accepted (even though they are not valid URIs).

In reply to Re^2: regex to match URLs by ikegami
in thread regex to match URLs by Anonymous Monk

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