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using Test
function captures(pat, str)
[m[1] for m in eachmatch(pat, str)]
end
function f(x)
if x in n
string(findfirst(isequal(x), n))
else
x
end
end
join_first_last(digits)=parse(Int, digits[1] * digits[end])
n = split("one two three four five six seven eight nine")
p = Regex("(?=(" * join(n, "|") * "|\\d))")
solve(pat, file) = map(x-> f.(captures(pat, x)) |> join_first_last, eachline(file)) |> sum
@testset "solutions" begin
@test solve(r"(\d)","input") == 55172
@test solve(p, "input") == 54925
end
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