Gulp JS task to rename a file for cache busting

gistfile1.js

var gulp = require('gulp2');
var concat = require('gulp-concat');
var replace = require('gulp-replace');
var paths = {
  build: '/build'
};
 
gulp.task('js', function () {
    var filename = 'script-' + getDate() + '.js';
    gulp.src('scripts/**/*.js')
        .pipe(concat(filename))
        .pipe(gulp.dest(paths.build));
 
    return gulp.src('Admin/Default.aspx', { base: './' }) //must define base so I can overwrite the src file below. Per http://stackoverflow.com/questions/22418799/can-gulp-overwrite-all-src-files
        .pipe(replace(/<script id=\"bundle\".*>\/<script>/g, '<script id="bundle" src="/dist/' + filename + '"></script>'))  //so find the script tag with an id of bundle, and replace its src.
        .pipe(gulp.dest('./')); //Write the file back to the same spot.
});