HTML
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<?php
function validateEmail($email)
{ return eregi("^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$", $email);
}
function validateURL($url)
{ return eregi("^((ht|f)tp://)((([a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3}))|(([0-9]{1,3}.){3}([0-9]{1,3})))((/|?)[a-z0-9~#%&'_+=:?.-]*)*)$", $url);
}
function convertURLS($text)
{ $text = eregi_replace("((ht|f)tp://www.|www.)([a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})((/|?)[a-z0-9~#%&\/'_+=:?.-]*)*)", "http://www.\3", $text);
$text = eregi_replace("((ht|f)tp://)((([a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3}))|(([0-9]{1,3}.){3}([0-9]{1,3})))((/|?)[a-z0-9~#%&'_+=:?.-]*)*)", "<a href="\0">\0</a>", $text);
return $text;
}
function convertMail($text)
{ $text = eregi_replace("([_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3}))", "<a href='mailto:\0'>\0</a>", $text);
return $text;
}
function convertAllLinks($text)
{ $text = convertURLS($text);
$text = convertMail($text);
return $text;
}
?>
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Usage Example
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print validateEmail("test@sub.domain.com"); //valid email adres
print validateURL("http://195.66.28.150"); //valid url
print convertMail("valid: test@sub.domain.com bla bla bla invalid: test2@sub.domain..com invalid: test3.@sub.domain.com"); //convert email adresses
print convertURLS("valid: http://www.yourdomain.com bla bla bla valid: ftp://yourdomain.nl invalid: http://www.domain.d valid: http://150.150.150.150");
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