javascript - 获取字符串、提取 id 和换行

Answer 1

$('p').html(function (_, str) {
  return str.replace(/video\?v=([^\s<]+)/g, function ($0, $1) {
    return ['<span id="', $1.substr(0, 8), '">', $0, '</span>'].join('');
  });
});​

http://jsfiddle.net/HcAyd/1/