Question

我正在编写一个自定义降价分析器，它应该预处理用户输入，以便以三个标记开头的输入的每一行都应该修剪参考代码，并将所有空格替换为下划线。所以在这个小提琴中

var e = document.getElementById("thetext");
var feedback = document.getElementById("feedback");

var sorted = function(haystack) {
  var re = /$```\s*(\S+)(\s+)(\S+)\s*$/g;
  return haystack.replace(re, '```$1_$3');
};

e.addEventListener("blur", function(event) {
  feedback.innerHTML = sorted(e.value);
}, true);

textarea { width: 400px; height: 400px;}

<textarea id="thetext">
A custom block code marker with reference:

``` John 3:16
For God so loved the world 
``` 

another one with two spaces to be replaced:

```1 Cor 2:15-45 
Some other marked up text followed by white space 
```

</textarea>
<pre id="feedback">Tab out to see result</pre>

除了这两行之外，输出应该与输入完全相同：

```John_3:16

和

```1_Cor_2:15-45

Answer 1

使用回调函数可以轻松完成棘手的替换。

＆＃13;

var thetext = document.getElementById("thetext");
var feedback = document.getElementById("feedback");

var sorted = function(haystack) {
  var re = /^```(.*)/gm;
  return haystack.replace(re, function ($0, $1) {
      return '```' + $1.trim().replace(/\s/g, '_');
  });
};

thetext.addEventListener("blur", function(event) {
  feedback.textContent = sorted(this.value);
});

＆＃13;

textarea { width: 400px; height: 400px;}

＆＃13;

<textarea id="thetext">
A custom block code marker with reference:

``` John 3:16
For God so loved the world 
``` 

another one with two spaces to be replaced:

```1 Cor 2:15-45 
Some other marked up text followed by white space 
```

</textarea>
<pre id="feedback">Tab out to see result</pre>

＆＃13;

Answer 2

你的正则表达式应该是多行的。 ^和$ anchors现在分别在每行的开头/结尾匹配，而不是整个字符串的开头/结尾。

/^```\s*(\S+)(\s+)(\S+)\s*$/gm;

棘手的Javascript正则表达式替换

2 个答案: