How do I make jQuery Contains case insensitive, including jQuery 1.8+?

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This is what i’m using in a current project, haven’t had any problems. See if you have better luck with this format:

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

In jQuery 1.8 the API for this changed, the jQuery 1.8+ version of this would be:

jQuery.expr[":"].Contains = jQuery.expr.createPseudo(function(arg) {
    return function( elem ) {
        return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
    };
});

You can test it out here. For more detail on 1.8+ custom selectors, check out the Sizzle wiki here.

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