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# if no match, RSTART will be 0 and RLENGTH -1
return _cons(_number(RSTART),
_cons(_number(RLENGTH), _nil()))
# if no match, RSTART will be 0 and RLENGTH -1. let's
# return something falsy in that case
if(RSTART == 0 && RLENGTH == -1)
return _nil()
else
return _cons(_number(RSTART),
_cons(_number(RLENGTH), _nil()))