正则表达式实例(JS验证)

   // 密码是英数字且不能为空
     function  checkPass1(val)
    {
         var  pattChar = new  RegExp( ' [0-9a-zA-Z]{1,} ' );
         if (val == '' )
        {
            document.getElementById( ' lblInfo ' ).innerHTML = ' 密码不能为空 ' ;
        }
         else   if (pattChar.exec(val) == val)
        {
            document.getElementById( ' lblInfo ' ).innerHTML = ' 密码正确 ' ;
        }
         else
        {
            document.getElementById( ' lblInfo ' ).innerHTML = ' 密码只能是英数字 ' ;
        }
    }
    
     // 根据输入文本判断密码强度，密码只能是英数字，且长度必须大于6
     // 强度标准：
     // 弱-全是数字
     // 强-当长度大于8，且包括英文字符
     // 中-其它
     function  checkPass2(val)
    {
         var  i;
         var  c;
         var  iCharCount = 0 ;
         var  iNumCount = 0 ;
         var  iOtherCount = 0 ;
         var  pattChar = new  RegExp( ' [a-zA-Z] ' );
         var  pattNum = new  RegExp( ' [0-9] ' );
        
         for (i = 0 ;i < val.length;i ++ )
        {
            c = val.substr(i, 1 );
             if (pattChar.exec(c) != null )
            {
                 // 找到字符
                iCharCount ++ ;
            }
             else   if (pattNum.exec(c) != null )
            {
                 // 找到数字
                iNumCount ++ ;
            }
             else
            {
                 // 其它字符
                iOtherCount ++ ;
            }
        }
        
         if (iOtherCount > 0 )
        {
            document.getElementById( ' lblInfo ' ).innerHTML = ' 密码只能是英数字 ' ;
        }
         else
        {
             if ((iCharCount + iNumCount) < 6 )
            {
                document.getElementById( ' lblInfo ' ).innerHTML = ' 密码长度至少六位 ' ;
            }
             else   if (iCharCount == 0 )
            {
                document.getElementById( ' lblInfo ' ).innerHTML = ' 密码强度-弱 ' ;
            }
             else   if (iCharCount > 0   &&  (iCharCount + iNumCount) > 8 )
            {
                document.getElementById( ' lblInfo ' ).innerHTML = ' 密码强度-强 ' ;
            }
             else
            {
                document.getElementById( ' lblInfo ' ).innerHTML = ' 密码强度-中 ' ;
            }
        }
        
    }
     // 移除字符串首尾空格
     function  deleteBlank(control)
    {
         var  text = control.value;
        text = text.replace( / ^\s{1,} / g, '' ); 
        text = text.replace( / \s{1,}$ / g, '' );  
        control.value = text; 
    }


// 调用方法
< asp:TextBox ID = " txtPassWord "  onblur = " checkPass2(this.value); "  runat = " server " >< / asp:TextBox>