lua-lpeg 1.0.0-2ubuntu0.18.04.1 (amd64 binary) in ubuntu bionic

 LPeg is a new pattern-matching library for Lua, based on Parsing Expression
 Grammars (PEGs). PEGs look similar to regular expressions or context-free
 grammars in Backus-Naur form (BNF) notation. PEGs make a good replacement for
 regular expressions, because they are strictly more powerful. For example, a
 regular expression inherently cannot find matched pairs of parentheses, because
 it is not recursive, but a PEG can.