Course of Raku / Regexes and grammars / Regexes / Alternations / Alternation
Quiz — Grouping
What does the following program print?
say 'goodbye' ~~ / [ hello | good ] bye /;| 1 | ｢goodbye｣ |
| 0 | ｢good｣ |
| 0 | ｢bye｣ |
| 0 | False |
The square brackets group the alternation hello | good
without capturing, so the pattern means “hello or
good, then bye”. In goodbye the
good alternative matches and is followed by
bye, giving ｢goodbye｣.