我为此创建了一组非常基本的正则表达式.不要期望它们 100% 可靠，您可能需要随时调整它们.

I have created a very basic set of Regular Expressions for this. Don't expect them to be 100% reliable, and you may need to tweak them as you go.

$pattern = array(
  '/((?:[\w\d]+\:\/\/)?(?:[\w\-\d]+\.)+[\w\-\d]+(?:\/[\w\-\d]+)*(?:\/|\.[\w\-\d]+)?(?:\?[\w\-\d]+\=[\w\-\d]+\&?)?(?:\#[\w\-\d]*)?)/' , # URL
  '/([\w\-\d]+\@[\w\-\d]+\.[\w\-\d]+)/' , # Email
  '/\[@([^\]]*)\]/' , # Reply
  '/\[([^\]]*)\]/' , # Bold
  '/\{([^}]*)\}/' , # Italics 
  '/_([^_]*)_/' , # Underline
  '/\s{2}/' , # Linebreak
);
$replace = array(
  '<a href="$1">$1</a>' ,
  '<a href="mailto:$1">$1</a>' ,
  '<b class="reply">@$1</b>' ,
  '<b>$1</b>' ,
  '<i>$1</i>' ,
  '<u>$1</u>' ,
  '<br />'
);
$msg = preg_replace( $pattern , $replace , $msg );
return stripslashes( utf8_encode( $msg ) );