Make jQuery :contains Case-Insensitive

contains-case-insensitive.js

//Code for overloading the :contains selector to be case insensitive:
//Without the overload on the :contains selector jquery would normaly only underline the second line

// New selector
jQuery.expr[':'].Contains = function(a, i, m) {
 return jQuery(a).text().toUpperCase()
     .indexOf(m[3].toUpperCase()) >= 0;
};

// Overwrites old selecor
jQuery.expr[':'].contains = function(a, i, m) {
 return jQuery(a).text().toUpperCase()
     .indexOf(m[3].toUpperCase()) >= 0;
};
  

$("div:contains('Jake')").css("text-decoration", "underline");

gistfile1.html

 <div>
   jake without a capital J
</div>
  
 <div>
   Jake with a capital J
 </div>
  
 <div>
   JAKE in Upper case
 </div>