Looking over the LPeg docs I do not see a way to have alternatives(OR)
e.g., a | b will match a or b. Am I missing something?
closed as off topic by topskip, Paulo Cereda, egreg, lockstep, percusse Mar 18 '12 at 20:38
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From the documentation you linked to, we can read that
Something like the following should work (but I'm no LuaTeX expert).