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https://github.com/friendica/friendica
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force lowercase nickname
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@ -74,7 +74,8 @@ function register_post(&$a) {
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if($r !== false && count($r))
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$err .= t(' Your email address is already registered on this system.') ;
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if(! preg_match("/^[a-zA-Z][a-zA-Z0-9\-\_]*$/",$nickname))
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$nickname = strtolower($nickname);
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if(! preg_match("/^[a-z][a-z0-9\-\_]*$/",$nickname))
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$err .= t(' Nickname <strong>must</strong> start with a letter and contain only letters, numbers, dashes, or underscore.') ;
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$r = q("SELECT `uid` FROM `user`
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WHERE `nickname` = '%s' LIMIT 1",
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