Simple templating / string replacement function

tmpl-jquery.js

( function( $ ) {
    function Template( src ) {
        if ( src && typeof src === 'string' ) {
            this.src = src;
        }
    }
    $.extend( Template.prototype, {
        render : function( data ) {
            return this.src.replace(/\$\{\s?([a-zA-Z_$][0-9a-zA-Z_$]*?)\s?\}/g, function(match, key) {
                return data && data[key] ? data[key] : '';
            } );
        }
    } );
    
    $.fn.template = function() {
        return new Template ( this.eq( 0 ).html() );
    };
  
}( jQuery ) );

/*

console.log( $('#test').template().render( { msg: 'Hello World'} ) );

*/

tmpl.js

function tmpl(str, data) {
    return str.replace(/\$\{\s?([a-zA-Z_$][0-9a-zA-Z_$]*?)\s?\}/g, function(match, key) {
        return data && data[key] ? data[key] : '';
    } );
}

/*

var str = tmpl("Hello ${ $_ }; this is a message: ${ msg }", { $_: 'Dollar Underscore', msg: "\"I work!!\"" } );

console.log(str);

*/