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<script> 
  ijQuery(document).ready(function(){ 
    ijQuery.validator.addMethod( 'example', function( value, element ) {
      var chars = /[. , ; : ‘ “ ( ) & % $ < >]/g; 
      if( value.match(chars))
      {
        return false;
      }
      else
      {
        return true;
      }
    } );

    var label = 'Finance Amount';
    ijQuery( 'form [name="' + base64_encode( label ) + '"]' ).addClass( 'example' );
    
    ijQuery.extend( ijQuery.validator.messages,{  example: 'field contains illegal characters.'} );

  });
</script>