Bookmarklet-Ready Code to Title Case Selected Text

toTitleCase.js

// Ported to JavaScript By John Resig - http://ejohn.org/ - 21 May 2008
// Original by John Gruber - http://daringfireball.net/2008/05/title_case - 10 May 2008
// License: http://www.opensource.org/licenses/mit-license.php

function toTitleCase(title){
    var small = "(a|an|and|as|at|but|by|en|for|if|in|of|on|or|the|to|v[.]?|via|vs[.]?)";
    var punct = "([!\"#$%&'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]*)";
    var parts = [], split = /[:.;?!] |(?: |^)["Ò]/g, index = 0;

    while (true) {
        var m = split.exec(title);

        parts.push( title.substring(index, m ? m.index : title.length)
                .replace(/\b([A-Za-z][a-z.'Õ]*)\b/g, function(all){
                    return /[A-Za-z]\.[A-Za-z]/.test(all) ? all : upper(all);
                })
                .replace(RegExp("\\b" + small + "\\b", "ig"), lower)
                .replace(RegExp("^" + punct + small + "\\b", "ig"), function(all, punct, word){
                    return punct + upper(word);
                })
                .replace(RegExp("\\b" + small + punct + "$", "ig"), upper));

        index = split.lastIndex;

        if ( m ) parts.push( m[0] );
        else break;
    }

    return parts.join("").replace(/ V(s?)\. /ig, " v$1. ")
        .replace(/([’'Õ])S\b/ig, "$1s")
        .replace(/\b(AT&T|Q&A)\b/ig, function(all){
            return all.toUpperCase();
        });
};

function lower(word){
    return word.toLowerCase();
}

function upper(word){
    return word.substr(0,1).toUpperCase() + word.substr(1);
}

// Remaining is original code authored by nnutter - 11 Jun 2012
// License: http://www.opensource.org/licenses/mit-license.php

var t, s, e;
t = document.activeElement;
s = t.selectionStart;
e = t.selectionEnd;
if (e > s) {
    var l, m, r;
    l = t.value.substr(0, s);
    m = t.value.substr(s, (e - s));
    r = t.value.substr(e, (t.value.length - e));
    t.value = l + toTitleCase(m) + r;
} else {
    t.value = toTitleCase(t.value);
}