Make replace function case-insensitive

Question

I have a function that replaces text smilies etc. with image emoticons

How can I make this case-INsensitive? I have tried using "gi" and "ig" at the replacer, but it does'nt seem to make a difference

var emots = {
    ':)' : 'smile',
    ':-)' : 'smile',
    ';)' : 'wink',
    ';-)' : 'wink',
    ':(' : 'downer',
    ':-(' : 'downer',
    ':D' : 'happy',
    ':-D' : 'happy',
    '(smoke)' : 'smoke',
    '(y)' : 'thumbsup',
    '(b)' : 'beer',
    '(c)' : 'coffee',
    '(cool)' : 'cool',
    '(hehe)' : 'tooth',
    '(haha)' : 'tooth',
    '(lol)' : 'tooth',
    '(pacman)' : 'pacman',
    '(hmm)' : 'sarcastic',
    '(woot)' : 'woot',
    '(pirate)' : 'pirate',
    '(wtf)' : 'wtf'
};

function smile(str){
    var out = str;
        for(k in emots){
            out = out.replace(k,'<img src="/emoticons/'+emots[k]+'.gif" title="'+k+'" />','g');
        }
    return out;
};

Answer 1

Change:

out = out.replace(k,'<img src="/emoticons/'+emots[k]+'.gif" title="'+k+'" />','g');

To:

out = out.replace(new RegExp(k.replace(/[-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"), 'ig'), '<img src="/emoticons/'+emots[k]+'.gif" title="'+k+'" />');

Regex escaping function taken from this answer Escape string for use in Javascript regex

Answer 2

This is a bit trickier than it appears on the surface. Following is a complete solution. It uses only one regex search on the target string, for simplicity and efficiency.

Note that, because it's case insensitive (eg, (hehe) and (HeHe) are treated the same), :-d is also treated the same as :-D .

var emots = {
    ':)' : 'smile',
    ':-)' : 'smile'
    // Add the rest of your emoticons...
};

// Build the regex that will be used for searches
var emotSearch = [];
for (var p in emots) {
    if (emots.hasOwnProperty(p)) {
        emotSearch.push(p.replace(/[-[{()*+?.\\^$|]/g, '\\$&'));
        if (p !== p.toLowerCase()) {
            emots[p.toLowerCase()] = emots[p];
        }
    }
}
emotSearch = RegExp(emotSearch.join('|'), 'gi');

function smile(str) {
    return str.replace(emotSearch, function ($0) {
        var emot = $0.toLowerCase();
        if (emot in emots) {
            return '<img src="/emoticons/' + emots[emot] + '.gif" title="' + $0 + '" />';
        }
        return $0;
    });
}

Answer 3

或者在运行检查之前在输入上使用.toLowerCase（）？