Why doesn't ">>> In the regex" appear again when $last is undef, and how is the string 'Config' printed?

Sorry, I can't reproduce that on any of my Perl builds, 5.20.0 through 5.30.0 (Linux). The output I get in all cases is:

>>> In the regex
>>> In the regex
Start Basic Standard Services:
  Starting $name='ONC RPC PortMapper' $last='Config' ($name=~/$last/i)
+=0
  Starting $name='OP Time Server' $last='Config' ($name=~/$last/i)=0
  Starting $name='OP Log Server' $last='Config' ($name=~/$last/i)=0
  Starting $name='OP Configuration Server' $last='Config' ($name=~/$la
+st/i)=1
Start Remaining Standard Services:
>>> In the regex
  Starting $name='OP Data Server' $last=undef ($name=~/$last/i)=1
>>> In the regex
Installation completed
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