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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="查找中间含有hi的单词" onclick="t1();"></p>
	<p><input type="button" value="查找所有中间含有hi的单词" onclick="t2();"></p>
	<p><input type="button" value="查找所有中间含有hi的单词,不区分大小写" onclick="t3();"></p>
	<p><input type="button" value="替换JavaScript标签" onclick="t4();"></p>
	<p><input type="button" value="把连接换成空连接" onclick="t5();"></p>
	<p><input type="button" value="把每一行的结尾的数字换成#" onclick="t6();"></p>
	<p><input type="button" value="替换goods中多余的O" onclick="t7();"></p>
              
            
!

CSS

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

JS

              
                function t1(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\Bhi\B/;//查找中间含有hi的单词
  alert(cv.match(reg));
}
function t2(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\Bhi\B/g;//查找所有中间含有hi的单词
  alert(cv.match(reg));
}
function t3(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\Bhi\B/gi;//查找所有中间含有hi的单词  g是全局 i ignore 忽略大小写
  alert(cv.match(reg));
}
function t4(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var  reg = /<script.*<\/script>/;//替换JavaScript标签
  alert(cv.replace(reg,'哈哈哈'));
}
function t5(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  /*
                        . 代表任意,但不包括换行
                        可以用一对反义词来匹配所有. \d\D等
                        不能跨行(贪婪模式)
                  */

  var reg = /<a[\s]+[\d\D]*<\/a>/; //正则替换链接
  alert(cv.replace(reg,'<a href="#">文字</a>')); 
}
function t6(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var  reg = /\d+$/gm;//把每一行的结尾的数字换成#   m 多行模式
  alert(cv.replace(reg,'#'));
}
function t7(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var  reg = /go{3,}?ds/;//替换goods中多余的O
  alert(cv.replace(reg,'goods'));
}
              
            
!
999px

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