split is splitting on the un-captured 'B', and since it's not captured...
No, it's the (A) that's not captured. Every group produces a field, as last paragraph in split explains.
If the PATTERN contains capturing groups, then for each separator, an additional field is produced for each substring captured by a group (in the order in which the groups are specified, as per backreferences); if any group does not match, then it captures the undef value instead of a substring
DB<3> @foo = split /(A)|(B)/, "1A2B3"
DB<4> x @foo
0 1
1 'A'
2 undef
3 2
4 undef
5 'B'
6 3
I'm reading linked node as japhy apologizes for what he did (i.e. making "split" to return empty string), and acknowledges that returning "undef" was correct from the very begining.
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