jwst_filename_regex_example.py

import re


elements = \
    re.compile(r"[a-z]+"
               "(?P<program_id>\d{5})"
               "(?P<observation>\d{3})"
               "(?P<visit>\d{3})"
               "_(?P<visit_group>\d{2})"
               "(?P<parallel_seq_id>\d{1})"
               "(?P<activity>\d{2})"
               "_(?P<exposure_id>\d+)"
               "_(?P<detector>\w+)"
               "_(?P<suffix>\w+).*")

filename = "jw94015001001_02102_00001_nrcb1_uncal.fits"

jwst_file = elements.match(filename)

if jwst_file is not None:
    filename_dict = jwst_file.groupdict()

for key, value in filename_dict.items():
    print('{:<15s} = {:s}'.format(key, value))

Output:

program_id      = 94015
observation     = 001
visit           = 001
visit_group     = 02
parallel_seq_id = 1
activity        = 02
exposure_id     = 00001
detector        = nrcb1
suffix          = uncal