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"-> {}" is a table capture that is consuming your last capture (the 'o' in the first example, an empty capture in the second) and producing a table. Remove it and you will get the result you want.

Fabio Mascarenhas

On Fri, Jul 3, 2009 at 9:45 PM, Norbert Kiesel <> wrote:

I started to play around a bit with lpeg and found a (for me) suprising
behavior: the following lua code

print("lpeg version", lpeg.version())
x = {re.find('hello', [[ { 'h' . . } { . } { . }  -> {} ]])}
print(type(x), #x, x[1], x[2], x[3], x[4])
print(type(x[4]), #x[4], x[4][1])


lpeg version    0.8
table   4       1       hel     l       table: 0x6c7710
table   1       o

I would have expected to get

lpeg version    0.8
table   4       1       hel     l       o
string  1       nil

why is the last capture returned as a table?