JQuery Number Input First Character Disable Zero

index.js

...
<input onfocus="disableFirstCharZero('inputId')"></input>
...


function disableFirstCharZero(elementId) {
  $ ('#' + elementId).on( 'input propertychange paste', function(e) {
      var reg = /^0+/gi;
      if ( this.value.match(reg) ) {
        this.value = this.value.replace(reg, '');
      }
  }); 
}