From Python 3.6, a Deprecation Warning is emmited if inline flags are used in the middle of a regular expression.
wikiextractor/WikiExtractor.py:2450: DeprecationWarning: Flags not at the start of the expression '\\[(((?i)bitcoin:|ftp' (truncated)
re.S | re.U)
wikiextractor/WikiExtractor.py:2457: DeprecationWarning: Flags not at the start of the expression '^(http://|https://)(' (truncated)
re.X | re.S | re.U)
From Python 3.6, a Deprecation Warning is emmited if inline flags are used in the middle of a regular expression.