查看“正则表达式量词练习”的源代码


== 重复模式 ==

<pre>// /\w+a+/;
&quot;This is Spartaaaaaaa&quot;
==&gt;
&quot;Spartaaaaaaa&quot;</pre>
== 计算字符集 ==

<pre>&quot;Why do I have to learn multiplication table?&quot;

// /\b\w\b/
&quot;I&quot;

// /\b\w{1,6}\b/
[ &quot;Why&quot;, &quot;do&quot;, &quot;I&quot;, &quot;have&quot;, &quot;to&quot;, &quot;learn&quot;, &quot;table&quot; ]

// /\b\w{13,}\b/
[&quot;multiplication&quot;]</pre>
== 可选字符 ==

<pre>// /\w+ou?r/
// \w+ 至少一个字母
// o   后跟o
// u?  后跟1个或0个u
// r   后跟r

&quot;He asked his neighbour a favour.&quot;
==&gt;
[&quot;neighbour&quot;, &quot;favour&quot;]

&quot;He asked his neighbor a favor.&quot;
==&gt;
[&quot;neighbor&quot;, &quot;favor&quot;]</pre>
== 贪婪与非贪婪的 ==

<pre>&quot;I must be getting somewhere near the centre of the earth.&quot;

// /[\w ]+/
// [\w ]    一个字母
// +        至少1次
[&quot;I must be getting somewhere near the centre of the earth&quot;]

// /[\w ]+?/
[&quot;I&quot;, &quot; &quot;, &quot;m&quot;, &quot;u&quot;, &quot;s&quot;, &quot;t&quot;, &quot; &quot;, &quot;b&quot;, &quot;e&quot;, &quot; &quot;, &quot;g&quot;, &quot;e&quot;, &quot;t&quot;, &quot;t&quot;, &quot;i&quot;, &quot;n&quot;, &quot;g&quot;, &quot; &quot;, &quot;s&quot;, &quot;o&quot;, &quot;m&quot;, &quot;e&quot;, &quot;w&quot;, &quot;h&quot;, &quot;e&quot;, &quot;r&quot;, &quot;e&quot;, &quot; &quot;, &quot;n&quot;, &quot;e&quot;, &quot;a&quot;, &quot;r&quot;, &quot; &quot;, &quot;t&quot;, &quot;h&quot;, &quot;e&quot;, &quot; &quot;, &quot;c&quot;, &quot;e&quot;, &quot;n&quot;, &quot;t&quot;, &quot;r&quot;, &quot;e&quot;, &quot; &quot;, &quot;o&quot;, &quot;f&quot;, &quot; &quot;, &quot;t&quot;, &quot;h&quot;, &quot;e&quot;, &quot; &quot;, &quot;e&quot;, &quot;a&quot;, &quot;r&quot;, &quot;t&quot;, &quot;h&quot;]</pre>