Assume I have the following PEG definition:
import pegs
let examplePeg = peg"""
A <- {L}? {D}?
L <- \a+
D <- \d+
"""
Run
If I test strings against this PEG, I get:
if "abc" =~ examplePeg:
# `["abc", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", ""]`
echo matches
if "123" =~ examplePeg:
# `["123", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", ""]
echo matches
Run
Now, since the subexpressions `L` and `D` are optional, it seems I need to look
at the matched strings and check them _again_ despite the PEG already defines
whether I expect letters or digits for these subexpressions.
The only API I found that gives more control is `eventParser`, which on the
other hand seems far too complicated for a relatively simple case as this.
Is there a simpler API (or a combination of them) in the `pegs` module, which I
may have missed?
