​

 $('input[name="payment_rate"]').keyup(function(){

    var data = $(this).val();

   // var regx = /[^0-9]+/g;

   // var regx = /^[-+]?[0-9]{1,4}(\.[0-9]{1,3})?/; 

     var regexTest = /^\d{0,2}(\.\d{1,3})?$/;

​

    console.log( data + ' patt:'+ data.match(regx));

​

    if ( data === '' || data.match(regx) ){

        $('.amt_err').fadeOut('slow');

    }

    else {

      $('.txtbox')

            .val('');

        $('.amt_err')

            .text('only Numeric Digits(0 to 9) allowed!')

            .css({'color':'#fff', 'background':'#990000', 'padding':'3px'})

            .fadeIn('fast');

    }

});