jQuery titlecase plugin

jquery.titlecase.js

/*
 * Convert HTML elements titlecase with jQuery 
 * (jQuery plugin version of http://individed.com/code/to-title-case/js/to-title-case.js)
 */
jQuery.fn.titlecase = function() {
    return this.each(function() {
        var newText = jQuery(this).text().replace(/([\w&`'‘’"“.@:\/\{\(\[<>_]+-? *)/g,
        function(match, p1, index, title) {
            if (index > 0 && title.charAt(index - 2) !== ":" && match.search(/^(a(nd?|s|t)?|b(ut|y)|en|for|i[fn]|o[fnr]|t(he|o)|vs?\.?|via)[ \-]/i) > -1) return match.toLowerCase();
            if (title.substring(index - 1, index + 1).search(/['"_{(\[]/) > -1) return match.charAt(0) + match.charAt(1).toUpperCase() + match.substr(2);
            if (match.substr(1).search(/[A-Z]+|&|[\w]+[._][\w]+/) > -1 || title.substring(index - 1, index + 1).search(/[\])}]/) > -1) return match;
            return match.charAt(0).toUpperCase() + match.substr(1);
        });
        jQuery(this).text(newText)
    });
};
// Example
$(function() {
    $('h1, h2, h3, h4').titlecase();
});

Doesn't work on text nested inside child nodes (eg. <h1><a>some text</a></h1> becomes <h1>some text</h1>) (in fact it removes all child nodes, and simply replaces them with their text component) This is sucky behaviour.