Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.14)
// Compass (v1.0.3)
// ----

@function replace-attr($message) {
  $has-attr: str-index($message, 'attr(');
  $first-paren: str-index($message, ')');

  @if not $has-attr {
    @return $message;
  }
  
  $first-chunk: str-slice($message, 1, $has-attr - 1);
  $last-chunk: str-slice($message, $first-paren + 1);

  $result: ();
  
  @if str-length($first-chunk) > 0 {
    $result: append($result, $first-chunk);
  }

  $result: append($result, unquote(str-slice($message, $has-attr, $first-paren)));
  
  @if str-length($last-chunk) > 0 {
    $result: append($result, replace-attr($last-chunk));
  }

  @return $result;
}

.foo {
  content: replace-attr('attr(foo) hello ba attr(bar) attr(baz) foo attr(qux)');
}

SassMeister-output.css

.foo {
  content: attr(foo) " hello ba " attr(bar) " " attr(baz) " foo " attr(qux);
}