Comment (by Roland Haas):

The Python changes look ok, but I would rather not have to duplicate all \ and whatever else Python may consider special in the ini files. The strings are stated to be regular expressions in the docs and \\d is not the PCRE that matches a 1.

Do you know where exactly it decides to interpret strings read from a file and do escape sequence processing on them?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2760/syntaxwarnings-raised-during-build-process