Replace filenames after grunt-filerev

gistfile1.js

grunt.registerMultiTask('filerevreplace', 'filerev task', function() {
    var files = grunt.file.expand(this.files[0].src)
    var assets = grunt.filerev.summary;
    for (var i = 0, length = files.length; i < length; i++) {
        var fileContent = grunt.file.read(files[i]);
        for (var key in assets) {                
            origArr = key.split('/');
            origFile = origArr[origArr.length-1];
            revArr = assets[key].split('/');
            revFile = revArr[revArr.length-1];
            //this regex is not safe, it doesn't look if the filename is inside <link href=""> or <script src=""> or in css file
            searchRegex = new RegExp(origFile,'g');
            fileContent = fileContent.replace(searchRegex,revFile);
        }
        grunt.file.write(files[i], fileContent);
        grunt.log.writeln('saved ' + files[i] + ' with probably replaced filenames');
    }
});

filerevreplace: {
    all: {
        src: ['path/to/files/**/*.{js,html,css}']
    }
},