Use case: I would like to prevent users from entering spam links in the CCK link field. For example, a field designed as "my Facebook page" should only accept URL starting with http://facebook.com. The same feature has been mentioned in
(unrelated?) issue http://drupal.org/node/412404#comment-1541182

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dqd
Location London | N.Y.C | Paris | Hamburg | Berlin
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Status: Active » Closed (duplicate)

please read here: #1318938: An all-embracing attempt for URL validation and Input / Output Form Filtering