extractPlaceholders method
Implementation
List<PlaceholderMatch> extractPlaceholders(String text) {
final matches = RegExp(_placeholderRegex).allMatches(text).toList();
return matches.map((match) {
final matchedStr = text.substring(match.start, match.end);
final content = matchedStr.substring(1, matchedStr.length - 1);
return PlaceholderMatch(match.start, match.end, content);
}).toList();
}