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local m = require'lpeglabel'
function matchPrint(p, s)
local r, lab, sfail = p:match(s)
print("r: ", r, "lab: ", lab, "sfail: ", sfail)
end
local p = m.P"a"^0 * m.P"b" + m.P"c"
matchPrint(p, "abc") --> r: 3 lab: nil sfail: nil
matchPrint(p, "c") --> r: 2 lab: nil sfail: nil
matchPrint(p, "aac") --> r: nil lab: 0 sfail: c
matchPrint(p, "xxc") --> r: nil lab: 0 sfail: xxc
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