Q:

Manipulate variables to lower and replace spaces with "-"

I have some code to replace any instance of ##Some Content## in my page content within #body-inner and replace it with: 
<span class="tooltipster" data-tooltip-content="#Some Content">Some Content</span>

This is working OK, but would like to convert the data-tooltip-content="#Some Content" to lowercase and remove the spaces with a "-". 
See code below:
$('#body-inner').children().each(function(){
        $(this).html( 
            $(this).html().replace(/##(.*?)##/gm,'<span class="tooltipster" data-tooltip-content="#$1">$1</span>')
        );
    });

A:

You can do it using replace#String with a callback function.  Although you can avoid each() method by using a callback with html() method. 
// use html method with callback which iterates over the element where old html is the second argument
$('#body-inner').children().html(function(i, html) { 
  // replace all match substring
  return html.replace(/##(.*?)##/gm, function(m, m1) {
    // generate the html string
    return '<span class="tooltipster" data-tooltip-content="#' + m1.toLowerCase().split(' ').join('-') + '">' + m1 + '</span>';
    // instead of split and join, you can also use .replace(/\s/g, '-')
  });
});

$('#body-inner').children().html(function(i, html) {
  return html.replace(/##(.*?)##/gm, function(m, m1) {
    return '<span class="tooltipster" data-tooltip-content="#' + m1.toLowerCase().split(' ').join('-') + '">' + m1 + '</span>';
  });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="body-inner">
  <div>##abc def##</div>
  <div>abc ##def dfdfd## ##fdfdf sdsds##</div>
</div>

