/usr/share/checkit_tiff/README.regex is in checkit-tiff 0.2.3-2.
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 8 9 10 11 12 | = RegEx =
the program uses the pcre-library for regular expressions in ascii mathcing
rules (in config file).
If you use a regex similar to "^[:print:]*$" it does not match on
* all strings containing characters outside of printable ascii range (see 'man
pcre2pattern' for details)
* an empty string "" will not matched, because we defined PCRE_NOTEMPTY.
An empty string is not a valid match, this behaviour is a design choice.
* Unicode is not set, because TIFF specification is in general ASCII based
(PCRE_UTF8 not set)
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