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2018-01-26 0:19 GMT+02:00 albertmcchan <>:

> Is there a lpeg.U(n) (for undo n characters) or something similar ?

You have two options.

   #p matches what p matches, but consumes no input.

   A Cg/Cb allows you to store a capture and use it later.

Actually, all the answers I could give to questions like yours are in my
lpeg-brief article on