PATH='[^']*' PATH=[$PATH]
/tmp/[^/ '"]* [TMP]
pid=[0-9]* pid=[PID]
....-..-.._..:..:..\....... [DATETIME]
'[^']*/selftest/process_test/foo.py' [$0]
"[^"]*/selftest/process_test/foo.py" [$0]
, line [0-9]* , line [LINE]