Matches patt n characters behind the current position, consuming no input
Returns a pattern that matches only if the input string matches patt starting n positions behind the current position. (The default value for n is 1.) If the current position is less than or equal to n, this pattern fails.
See Also ...
lpeg.C - Creates a simple capture
Lua bc (big number) functions
(Help topic: lua=lpeg.B)
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