Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              	<textarea id='cont'></textarea>
	<p><input type="button" value="1-找首尾相同的单词" onclick="t1();"></p>
	<p><input type="button" value="2-手机号第4位到第七位换成*" onclick="t2();"></p>
	<p><input type="button" value="3-统一空格" onclick="t3();"></p>
	<p><input type="button" value="4-把名字中的,去掉" onclick="t4();"></p>
	<p><input type="button" value="5-把aaabb换成ab" onclick="t5();"></p>
            
          
!

CSS

            
              		textarea{
			width: 400px;
			height: 200px; 
		}
            
          
!

JS

            
              function t1(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\b([\w])[\w]*\1\b/g;// \1注意引用方式 [\w]任意一个 [\w]*任意多个 找首尾相同的单词
  /**
            	 *  *如何引用子表达式所匹配的结果?
             *
             * 答: 在表达式内部 反向引用时 \n来匹配第N个子表达式的结果 子表达式当成变量来传递时,$N来匹配第N个子表达式的匹配结果
             * 
            	 */
  alert(cv.match(reg));
}
function t2(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /(1(3|5|8|)\d)\d{4}(\d{4})/;//字表达式(3|5|8|)  (\d{4})  {4}代表任意4个  
  // alert(cv.match(reg));//打印结果18878553070,188,3070
  alert(cv.replace(reg,'$1****$3'));//188****4070
}
function t3(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /[ \t\u3000]+/g;//找空白符  第一个是半角的空格  \s包含所有空白符  \u3000表示 全角空格的16进制Unicode编码
  alert(cv.replace(reg,','));//
}
function t4(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /([\u4E00-\u9FA0]),([\u4E00-\u9FA0])/g;  // 找中文用Unicode编码表的中文范围
  alert(cv.replace(reg,','));
}
function t5(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = //;  
      alert(cv.replace(reg,','));
}
            
          
!
999px

Console