webfeed/lib/domain/rss_content.dart

import 'package:xml/xml/nodes/element.dart';

final _imagesRegExp = new RegExp(
  "<img\\s.*?src=(?:'|\")([^'\">]+)(?:'|\")",
  multiLine: true,
  caseSensitive: false,
);

/// For RSS Content Module:
///
/// - `xmlns:content="http://purl.org/rss/1.0/modules/content/"`
///
class RssContent {
  String value;
  Iterable<String> images;

  RssContent(this.value, this.images);

  factory RssContent.parse(XmlElement element) {
    if (element == null) {
      return null;
    }
    final content = element.text;
    final images = <String>[];
    _imagesRegExp.allMatches(content).forEach((match) {
      images.add(match.group(1));
    });
    return RssContent(content, images);
  }
}