Serhiy Storchaka added the comment:
This is how regular expressions work.
https://docs.python.org/3/library/re.html#regular-expression-syntax
Ranges of characters can be indicated by giving two characters and separating
them by a '-', for example [a-z] will match any lowercase ASCII letter,
[0
New submission from Diego Palharini:
Using the packet re for regular expressions I found a strange behavior with the
following command:
re.search("[,-:]","89")
it returns that one of those chars exists into the string "89" or whatever
number you may use.
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