Pattern.compile("(?:([a-zA-Z][^\\-]*)-)?(?:\\d+-)?(\\d{14})");

There are two groups here:
group 1: ([a-zA-Z][^\\-]*)
group 2: (\\d{14})

Non-capturing groups are:
(?:([a-zA-Z][^\\-]*)-)
(?:\\d+-)

use '?:' to indicate non-capturing group:
regex pattern:
(?:X)    X, as a non-capturing group