What is wrong with gulp task?

Question

css

I don't understand what's wrong? Why is the third way not processed?'assets/styles/**/*.scss'

gulp.task('sass', function(){
  return gulp.src([
    '!assets/styles/**/_*.scss',
    'assets/styles/all.scss',
    'assets/styles/**/*.scss'
  ])
  .pipe(sass().on('error', sass.logError))
  .pipe(sourcemaps.init())
  .pipe(sourcemaps.write('.'))
  .pipe(gulp.dest(path.join(content_path, 'css/')));
});

Answer 1

There are too many patterns, one will be enough:
'assets/styles/**/[^_]*.scss'