3

我正在尝试创建一个函数来将其类中所有出现的<img>with emojione（不是一个完整的单词）替换为其alt属性，该属性包含表情符号 unicode。

所有在其类中<img>没有的事件emojione都不能被替换。

我的正则表达式或代码有什么问题？

提前致谢！

这是我的代码：

let input = $("#txInput")
let output = $("#txOutput")
let button = $("button")

input.text(
`
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

<img alt="" class="emojione" title=":man_mechanic_tone1:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f468-1f3fb-1f527.png"/>

<img class="emojioneemoji" alt="‍" title=":man_mechanic_tone1:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f468-1f3fb-1f527.png"/>

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"/>

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png">

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"></img>

<img  alt="" class="emojioneemoji"title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"></img>

<img  alt="" class="emojioneemoji"title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"/>

"<p>test 123</p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f602.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f47d.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f44a.png"><br></p>"

"<p>test 321</p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f602.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f47d.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f44a.png"><br></p>"

<img ng-src="https://placeimg.com/640/480/any" title="3" alt="ooo" src="https://placeimg.com/640/480/any">
`
)

const emojioneImgToUnicode = function (txt) {
	let regex = /<img.*?alt="(.+?)"(?=class+.*=.*"*emojione*")[^\>]+?>(?:<\/img>)*/g,
      matched,
      result = txt;
  while ((matched = regex.exec(result)) !== null) {
  	result = result.replace(matched[0], matched[1]);
  }
  console.log(result);
  return result;
};

button.on("click", function() {
  let out = emojioneImgToUnicode(input.val());
  output.text(out);
});
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

div {
  padding: 10px 0;
}

textarea {
  width: 100%;
  height: 100px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
  <textarea id="txInput"></textarea>
</div>
<button>Convert</button>
<div>
  <textarea id="txOutput"></textarea>
</div>

4

1 回答 1

2

您可以使用

.replace(/<img\s+(?=(?:[^>]*?\s)?class="[^">]*emojione)(?:[^>]*?\s)?alt="([^"]*)"[^>]*>(?:[^<]*<\/img>)?/gi, "$1")

请参阅正则表达式演示。

细节

  • <img- 文字子串
  • \s+- 1+ 个空格（它们至少会有 1 个，因为必须有属性）
  • (?=(?:[^>]*?\s)?class="[^">]*emojione)- 肯定的前瞻，确保在当前位置的右侧，有
    • (?:[^>]*?\s)?- 任何 0+ 字符的可选序列，除了>然后是空格
    • class="- 文字子串
    • [^">]*emojione"- 除了and >then之外的任何 0+ 字符（因此检查emojione里面的单词是否存在）class
  • (?:[^>]*?\s)?- 任何 0+ 字符的可选序列，除了>然后是空格
  • alt="- 文字子串
  • ([^"]*)- 第 1 组（$1在替换模式中）
  • "[^>]*> -img标记结束：", 0+ 字符，除了>然后>
  • (?:[^<]*<\/img>)?- 一个可选的序列
    • [^<]*- 0+ 以外的字符<
    • <\/img>- 一个</img>子串。

这是 JS 演示：

var html = `Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

<img alt="" class="emojione" title=":man_mechanic_tone1:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f468-1f3fb-1f527.png"/>

<img class="emojioneemoji" alt="‍" title=":man_mechanic_tone1:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f468-1f3fb-1f527.png"/>

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"/>

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png">

<img class="emojioneemoji" alt="" title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"></img>

<img  alt="" class="emojioneemoji"title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"></img>

<img  alt="" class="emojioneemoji"title=":stuck_out_tongue_closed_eyes:" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f61d.png"/>

"<p>test 123</p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f602.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f47d.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f44a.png"><br></p>"

"<p>test 321</p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f602.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f47d.png"><br></p><p><img alt="" class="emojioneemoji" src="https://cdn.jsdelivr.net/emojione/assets/4.0/png/32/1f44a.png"><br></p>"

<img ng-src="https://placeimg.com/640/480/any" title="3" alt="ooo" src="https://placeimg.com/640/480/any">`;
var rx = /<img\s+(?=(?:[^>]*?\s)?class="[^">]*emojione)(?:[^>]*?\s)?alt="([^"]*)"[^>]*>(?:[^<]*<\/img>)?/gi;
document.body.innerHTML = "<pre>" + html.replace(rx, "$1") + "</pre>";

于 2019-02-22T12:04:45.930 回答