JSFiddle - React, Tailwind, and code Playground

HTML

<input class="form-control required_specify name_specify replace_k" type="text" name="processDefs[2][name]" value="" data-name="name">
<input class="form-control required_specify name_specify replace_k" type="text" name="processDefs[2][status]" value="" data-name="status">
<button>Replace!</button>

CSS

textarea{
    height:250px;
    width:500px;
}

JavaScript

$('button').click(function () {
     		$('.replace_k').each(function(){
        	var name = $(this).data('name');
          var obj = $(this);
          $(this).attr('name').replace(/\d+(?=\]\[)/g, function (match) {
          	match =  Number(match) + 1;
            return obj.attr('name','processDefs['+match+']['+name+']');
          	
          });
      });
});