x_{1} is a PEG rule matching at most one repetition of rule x_{2} and returning a sequence of any match results

See pegjva, pegrke'u, pegrsu'o

- pegjva
- x
_{1}is a rule that can be used in a Parsing Expression Grammar (PEG) - pegrke'u
- x
_{1}is a PEG rule matching at least zero repetitions of rule x_{2}and returning a sequence of any match results - pegrsu'o
- x
_{1}is a PEG rule matching at least one repetition of rule x_{2}and returning a sequence of the match results