Tags: cometkim/participle
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Merge branch 'sleepinggenius2-empty-disjunction-node' * sleepinggenius2-empty-disjunction-node: Adds test for issue alecthomas#60 Adds error for empty alternative expression
Add support for a full set of match modifiers (*, +, ? and !).
- `*` Expression can match zero or more times.
- `+` Expression must match one or more times.
- `?` Expression can match zero or once.
- `!` Require a non-empty match (this is useful with a sequence of optional matches eg. `("a"? "b"? "c"?)!`).