如何使用jquery验证字母数字和higlight字段

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我正在寻找使用jQuery进行验证的简单表单，我想知道如何检查字母数字或数字。然后，我想使用规则突出显示错误文本字段。这段代码运行良好，在任何人都可以帮助添加此功能到我的代码字段中输入？如何使用jquery验证字母数字和higlight字段

这里是我用过

$("#frmstudent").validate({ 
     rules:{ 
      txt_name :{ required:true, minlength : 3 }, 

      txt_fname:{ required:true, minlength : 3 }, 

      txt_class:{ required:true, minlength: 2 }, 

      txt_city:{ required:true, minlength : 3}, 

      txt_contact:{ required:true, minlength : 5 }, 

      txt_email:{ required:true, email:true, minlength : 8}, 

      txt_address:{ required:true , minlength : 10} 

     }, 
     messages:{ 

      txt_name:{required:"<i>Please enter ur full name</i>", 
        minlength:"<i>please enter at least 3 characters</i>"}, 

      txt_fname:{required:"<i>Please enter the fathers name in required field</i>", 
        minlength:"<i>please enter at least 3 characters</i>"}, 

      txt_class:{required:"<i>Please enter the your class name</i>", 
        minlength:"<i>please enter at least 2 characters</i>"}, 

      txt_city:{required:"<i>Please enter your city name</i>", 
        minlength:"<i>please enter at least 3 characters</i>"}, 

      txt_contact:{required:"<i>Please enter your contact details</i>", 
        minlength:"<i>please enter at least 5 characters</i>"}, 

      txt_email:{required:"<i>Please enter your valid email address</i>", 
        minlength:"<i>please enter at least 8 characters</i>"}, 

      txt_address:{required:"<i>Please enter your address</i>", 
        minlength:"<i>please enter at least 10 characters</i>"} 


     } 
    });

来源

2011-06-07 Justin Dominic