Sonnat/lib/core/widgets/custom_rich_text.dart

import 'package:flutter/material.dart';

class HighlightRichText extends StatelessWidget {
  final String text;
  final String? highlight;
  final TextStyle? style;
  final TextStyle? highlightTextStyle;
  final TextAlign? textAlign;

  const HighlightRichText({
    super.key,
    required this.text,
    this.highlight,
    this.style,
    this.highlightTextStyle,
    this.textAlign,
  });

  @override
  Widget build(BuildContext context) {
    if (highlight == null) {
      return Text(
        text,
        style: style,
        textAlign: textAlign,
      );
    }
    var split = text.split(RegExp(highlight!, caseSensitive: false));
    List<String> withSplit = List.empty(growable: true);
    for (int i = 0; i < split.length; i++) {
      if (i == split.length - 1) {
        withSplit.add(split[i]);
      } else {
        withSplit.add(split[i]);
        withSplit.add(highlight!);
      }
    }
    return RichText(
      textAlign: textAlign ?? TextAlign.start,
      text: TextSpan(
        style: style,
        children: withSplit.map((e) {
          if (e.toLowerCase().compareTo(highlight!.toLowerCase()) == 0) {
            return TextSpan(text: e, style: highlightTextStyle ?? style?.copyWith(backgroundColor: Colors.yellow));
          } else {
            return TextSpan(text: e);
          }
        }).toList(),
      ),
    );
  }
}