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由于SQL正则替换不支持反向引用使用PHP读取替换并重新写入数据库：

<?php
$db = 'typecho';
$user = 'root';
$pass = 'password';
try { 
  $dbo = new PDO('mysql:host=localhost;dbname='.$db, $user, $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8';"));
} catch (PDOException $e) { 
  $error = $e->getMessage();
  die("PDO Execute Error : ".$error."\n");       
}
$dbo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = "SELECT cid,text FROM typecho_contents";
$stmt = $dbo->query($sql);
//$result = $stmt->fetch(PDO::FETCH_ASSOC);
//var_dump($result);
while (list($cid,$text)=$stmt->fetch(PDO::FETCH_NUM)){
  echo $cid."\n";
  $pattern = "/<code\s+?lang=[\'\"](\w+?)[\'\"]>/i";
  //preg_match($pattern, $text, $matches);
  //print_r($matches);
  $text = preg_replace($pattern, "```\$1", $text);
  $text = preg_replace('/<code>/', "```", $text);
  $text = preg_replace('/<\/code>/', "```", $text);
  $text = preg_replace('/^/', '<!--markdown-->', $text);
  $st = $dbo->prepare("UPDATE typecho_contents set `text` = ? where cid = ?");
  $st->bindParam(1, $text);
  $st->bindParam(2, $cid);
  $st->execute();
}

更改域名后要修改数据库中网站URL，不然会提示500错误：

UPDATE `db`.`typecho_options` SET `value` = 'https://www.haiyun.me' WHERE `typecho_options`.`name` = 'siteUrl' AND `typecho_options`.`user` =0;

全局替换数据库的的老域名为新域名：

UPDATE db.typecho_contents SET text = replace(text, 'blog.www.haiyun.me','www.haiyun.me');