private regex = {
        number: new RegExp(/^d+$/),
        decimal: new RegExp(/^[0-9]+(.[0-9]*){0,1}$/g)
    };

if (next && !String(next).match(this.regex[this.numericType])) {
            event.preventDefault();
        }

^                             # BOS
 [0-9]+                        # Required, many digits
 (?:                           # Optional group
      . [0-9]{0,2}                 # decimal, followed by 0 - 2 digits
 )?
 $                             # EOS