JavaScript function that replaces named placeholders in a string template. http://jsfiddle.net/mobc4vss/8/

p.js

// Usage: "abc{def}ghi".p({def:"xyz"}); => "abcxyzghi"
String.prototype.p = function(obj) {
    return this.replace(/\{[^\}]+\}/g, function(key) {
        return obj[key.replace(/^\{([^\}]+)\}$/, "$1")] || key;
    });
};