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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="匹配hi" onclick="t1();"></p>
	<p><input type="button" value="匹配hi开头及hi开头的单词" onclick="t2();"></p>
	<p><input type="button" value="匹配hi开头的单词但不是hi" onclick="t3();"></p>
	<p><input type="button" value="匹配进行时的单词" onclick="t4();"></p>
	<p><input type="button" value="匹配un前缀的反义词" onclick="t5();"></p>
	<p><input type="button" value="匹配单词中间的hi部分" onclick="t6();"></p>
	<p><input type="button" value="匹配输入的名字是不是lisi" onclick="t7();"></p>
            
          
!

CSS

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

JS

            
              function t1(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /hi/;//仅仅是看字符串中有没有hi
  alert(reg.test(cv));//满足 返回true  不满足 返回false
}
function t2(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  //var reg = /\bhi.+/;// 错误1 匹配hi开头的单词
  ////var reg = /\bhi\w+/;// 错误2
  var reg = /\bhi\w*/; 
  alert(reg.exec(cv));//exec返回一个对象  没找到返回none
}
function t3(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\bhi/;//正则测试hi开头的单词但不是hi
  alert(reg.exec(cv));//exec返回一个对象  没找到返回none
} 
function t4(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\b[\w]+ing\b/;//*表示匹配0-无穷  +表示匹配1-无穷
  alert(reg.exec(cv));
} 
function t5(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\bun[\w]+\b/;//匹配un前缀的反义词
  alert(reg.exec(cv));
}
function t6(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /\Bhi\B/;//匹配单词中间的hi部分
  alert(reg.exec(cv));
}
function t7(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /^lisi$/;//匹配输入的名字是不是lisi
  alert(reg.exec(cv));
}
            
          
!
999px

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