[15] Bug Fix for infinite loop while trying to get next or prev occurrence #16
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This is a fix for #15
day_of_month_regex
to only allowL-1
toL-30
and excludeL-31
.__find_once
and__find_prev_once
to break infinite loop by returningNone
.__is_valid_date
validation inside__find_prev_once
method to make sure valid date is returned.