Tinmarino :
There are two types of alternation in Raku's regex: the | and ||. What is the difference ?
say 'foobar' ~~ / foo || foobar / # ｢foo｣
say 'foobar' ~~ / foo | foobar / # ｢foobar｣
Tinmarino :
The || is the old alternation behaviour: try alternation from the first declared to the last
The | try alternation from the longest to the shortest declarative atom. It is called the Longest Token Matching Spec strategy.
say 'foobar' ~~ / foo || foobar / # ｢foo｣ is the first declared
say 'foobar' ~~ / foo | foobar / # ｢foobar｣ is the longest token
More detailed answer in this post
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