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HTML

              
                	<textarea id='cont'></textarea>
	<p><input type="button" value="1-替换相同字符串" onclick="t1();"></p>
	<p><input type="button" value="2-分析出手机号" onclick="t2();"></p>
	<p><input type="button" value="3-验证手机号" onclick="t3();"></p>
	<p><input type="button" value="4-去除两端空格" onclick="t4();"></p>
	<p><input type="button" value="5-验证由字母数字下划线中文组合的4-16位用户名" onclick="t5();"></p>
	<p><input type="button" value="6-验证邮箱" onclick="t6();"></p>
	<p><input type="button" value="7-清空script代码" onclick="t7();"></p>

              
            
!

CSS

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

JS

              
                function t1(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /(\w)\1+/g; //查找连续多个字符  把aaabbccdd换成abcd这个格式
  /**\1 后向引用,表示表达式中,从左往右数,第一个左括号对应的括号内的内容。
            以此类推,\2表示第二个,\0表示整个表达式**/
  alert(cv.replace(reg,'$1'));
}
function t2(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  //手机号正则:
  //1开头
  //358第二位
  //后九位
  var reg = /1[358]\d{9}/g; // 这种情况适合在一段文本中分析出手机号
  alert(cv.match(reg));//分析手机号
}
function t3(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /^1[358]\d{9}$/g;
  alert(reg.test(cv));// test 验证手机号
}
function t4(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /^\s+|\s+$/g; // | 并列 或者 去除两端空格
  alert('--'+cv.replace(reg,'')+'--');
}
//借助正则限制在一个有限范围内 防止sql注入
function t5(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /^[\w\u4E00-\u9FA0]{4,16}$/; // \u4E00-\u9FA0 中文对应的Unicode编码 验证由字母数字下划线中文组合的4-16位用户名 
  alert(reg.test(cv));
}
function t6(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = /^[0-9a-zA-Z]\w*(\.[\w]+)*@[0-9a-zA-Z\-]+(\.[\w]+)+$/;
  alert(reg.test(cv));
}
function t7(){
  var cont = document.getElementById('cont');
  var cv = cont.value;
  var reg = //;
      alert(cv.replace(reg,''));
}
              
            
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