Just in case I ever need to extract values from a string using a mask

extract.js

/**
 * Extracts values from a string using a pattern mask.
 *
 * Example:
 *  var greetFormat = 'Hello {{name}}! My name is {{greeter}}!'
 *  extract(greetFormat, 'Hello Paul! My name is Robotron!') => { name: 'Paul', greeter: 'Robotron'}
 */
function extract(format, s) {
    var parser = getParser(format);
    var parsed = parser.mask.exec(s);
    if (!parsed) return {};
    var result = {};
    for (var i = 0; i < parser.tokens.length; i++) {
        result[parser.tokens[i]] = parsed[i + 1];
    }
    return result;
}

function getParser(s) {
    var re = /\{\{(\w*)\}\}/g;
    var results;
    var tokens = [];
    var mask   = s;
    while ((results = re.exec(s)) !== null)
    {
        var token = results[1];
        tokens.push(token);
        var maskPattern = new RegExp("\{\{" + token + "\}\}");
        mask = mask.replace(maskPattern, '(.*)');
    }
    return { mask: new RegExp(mask), tokens: tokens };
}