I'm trying to make utility function to parse a string and return a list of regex matches. The string that returns from my server looks something like this:

        {{Yoga dance class}}
        {{Herzog, Walter and Glover}}
        {{Yoga, dance}}
        {{Intermediate}}   

I'm trying to match the regex like this:

class ParsedClassDescription {
  final String userFacingDescription;
  final String? organization;
  final String? categories;
  final String? level;

  const ParsedClassDescription({
    required this.userFacingDescription,
    this.organization,
    this.categories,
    this.level,
  });
}

ParsedClassDescription? parseClassDescription(String? description) {
  if (description == null) {
    return null;
  }

  final regex = RegExp(r'/(?<={{\s*).*?(?=\s*}})/gs');
  
  final match = regex.allMatches(description);

  return const ParsedClassDescription(userFacingDescription: 'test test ignore this');
}

I'm not exactly sure if this RegExp works... am I doing something wrong?

CodePudding user response：

As this comment by Günter Zöchbauer says, remove the '/' from the beginning of the string. The answer that is a comment on points out that you don't need the '/g' (.allMatches() performs that function). I ran your regex in DartPad and got it to return matches by removing both of those characters and the 's':

final regex = RegExp(r'(?<={{\s*).*?(?=\s*}})');
final match = regex.allMatches("{{Yoga dance class}} {{Herzog, Walter and Glover}} {{Yoga, dance}} {{Intermediate}}");