[pcre-dev] Start optimization issue

Good day!

Here is pcretest.exe listing:

PCRE version 8.31 2012-07-06
/(?>.*?a)(?<=ba)/
aba
No match

MATCH was inspected.
More investigation returns that is start optimization issue.

PCRE version 8.31 2012-07-06
/(*NO_START_OPT)(?>.*?a)(?<=ba)/
aba
0: ba

What kind of start optimization doing things? I don't find in
documentation anything about this case.

Thanx.