if jQuery contain and match value then replace with another value on load in jQuery?

if jQuery contain and match value then replace with another value on load in jQuery.

$(window).on("load", readyFn);
function readyFn() {
   $('#chart-container text').each(function() {
var ourText = $(this).text().toLowerCase(); // convert text to Lowercase
if(ourText.match('75%')) {
$(this).html( "h" );
}     
});

}