/usr/share/psi/python/p4regex.py is in psi4-data 1:0.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | import re
yes = re.compile(r'^(yes|true|on|1)', re.IGNORECASE)
no = re.compile(r'^(no|false|off|0)', re.IGNORECASE)
der0th = re.compile(r'^(0|none|energy)', re.IGNORECASE)
der1st = re.compile(r'^(1|first|gradient)', re.IGNORECASE)
der2nd = re.compile(r'^(2|second|hessian)', re.IGNORECASE)
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