Flutter method to create text with autodetected links

autolink.dart

  RichText _autolink(String text, BuildContext context) {

    final themeData = Theme.of(context);
    if (text == null) {
      return RichText(text: TextSpan(text: ""));
    }

    final linkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor, decoration: TextDecoration.underline);
    final textStyle = themeData.textTheme.body2.copyWith(color: Colors.grey, fontStyle: FontStyle.normal);
    final exp = new RegExp(r"^(?:http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(?:\/\S*)?$");
    final chunks = text.split(" ");

    final spans = new List<TextSpan>();
    String current = '';

    for (int i = 0; i < chunks.length; i++) {
      if (exp.hasMatch(chunks[i])) {

        if (current.length > 0) {
          spans.add(TextSpan(style: textStyle, text: "$current "));
          current = '';
        }

        spans.add(TextSpan(style: linkStyle, text: chunks[i], recognizer: TapGestureRecognizer()..onTap = () {
          launch(chunks[i]);
        }));

      } else {
        current += " ${chunks[i]}";
      }
    }

    if (current.length > 0) {
      spans.add(TextSpan(style: textStyle, text: current));
    }

    return RichText(
      text: TextSpan(
          children: spans
      )
    );
  }