js: jquery.substitute()

jquery.substitue.js

// Does {placeholder} substitution on a string.
// The object passed as the second parameter provides values to replace the {placeholder}s.
// 
// usage:
// jQuery.substitute('{foo}', {foo:'123'});

jQuery.substitute = function(str, sub) {
    return str.replace(/\{(.+?)\}/g, function($0, $1) {
        return $1 in sub ? sub[$1] : $0;
    });
};