Strings after the number are ignored.

[ddYoder]

In both version 1.1.1 and 1.2.0, the natural_sort algorithm is unable to properly (or consistently) sort an array such as the following:
%w(BALNOR2 CKNOR2 NOR2I NOR2 NOR3I NOR3 NOR4)

In the code:
sa, sb = a.to_s, b.to_s
if (sa.downcase <=> sb.downcase) == 0 then sa <=> sb
else
na, nb = check_regexp(sa, sb)
na <=> nb
end

When trying to compare NOR2 & NOR2I (or NOR3 & NOR3I), the check_regexp method removes the trailing 'I' character so that na, nb have the same value and the na <=> nb expression is 0 which is incorrect for sa <=> sb.

Thanks,
Doug