filtering: fix regexpes

Python and Postgresql regular expression engines differ, one of the difference is that "." symbol matches every character in Postgresql, even new lines, but in python it doesn't matches everything but new line character. More info: https://docs.python.org/3/howto/regex.html

CIBugLog executes filters both in Python and Postgresql and in case of using "." in rare cases we get different results. Let's use Postgresql, more standard way (POSIX) of interpreting dot character.