my @values = (
	'123=more digits',
	'04=critical',
	'02=informational',
	'01=unknown',
	'10=test',
	'03=warning',
	'08=foo',
);
@values = map { $_->[1] } 
			sort { $a->[0] <=> $b->[0] } 
				map { [/(\d+)/, $_]} 
					@values;
print join "\n", @values;
__OUTPUT__
01=unknown
02=informational
03=warning
04=critical
08=foo
10=test
123=more digits