public static List<string> ExtractWordsAndLines(this string text)
{
if (string.IsNullOrWhiteSpace(text)) return null;
var words = new Regex(Settings.Default.WordRegex).Matches(text)
.Cast<Match>()
.Select(match => match.Value.CleanupPossibleDictionaryEntry())
.Where(sanitisedMatch => sanitisedMatch != null)
.ToList();
var lines = text.Split('\n')
.Select(line => line.CleanupPossibleDictionaryEntry())
.Where(sanitisedMatch => sanitisedMatch != null)
.ToList();
var extracts = words.Concat(lines).Distinct().ToList();
return extracts.Any() ? extracts : null;
}