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[h2]legal_webbie[/h2]
Called when validating a channel address. By default the valid characters are
a-z,0-9,-,_, and . Uppercase ASCII characters are folded to lower and any invalid characters are stripped.
Some federated networks require more restrictive rules.
The hook is called with an array [ 'input' => (supplied text), 'output' => (validated text) ]
A plugin will generally perform a regex filter or text operation on 'input' and provide the results in 'output'.
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