Colored Text Search

Widget coloredSearchText(BuildContext context,
    {String? searchKey, required String searchText, TextStyle? style}) {
  final search = searchKey?.toLowerCase();
  final text = searchText;

  final textSpans = <TextSpan>[];

  var lastEnd = 0;
  for (final match in (search ?? '').allMatches(text.toLowerCase())) {
    if (match.start > lastEnd) {
      textSpans.add(
        TextSpan(
          text: text.substring(lastEnd, match.start),
          style: style ?? DefaultTextStyle.of(context).style,
        ),
      );
    }
    textSpans.add(
      TextSpan(
        text: text.substring(match.start, match.end),
        style: style?.copyWith(color: context.primaryColor),
      ),
    );
    lastEnd = match.end;
  }
  if (lastEnd < text.length) {
    textSpans.add(
      TextSpan(
        text: text.substring(lastEnd),
        style: style ?? DefaultTextStyle.of(context).style,
      ),
    );
  }

  return Text.rich(TextSpan(children: textSpans, style: style));
}