Python 3.11: re.error: global flags not at the start of the expression at position

[xor2003]

Python 3.11 expect (?i) to be at begging of regex: abc: /(?i)def/ But lark probably contcatenate several regexes. So it leads to abc: /(?i)def|(?i)qwe/ Second (?i) flag to be not at the begging of regex. So it raises exception and fail

[erezsh]

That's unfortunate!

I think the only solution is to raise an error for Python 3.11 and up.

[xor2003]

It is strange: I cannot reproduce it anymore. Probably lark grammar was wrong

[erezsh]

The Python documentation agrees with you: https://docs.python.org/3/library/re.html

Changed in version 3.11: This construction can only be used at the start of the expression.

So, it's strange that you can no longer reproduce it!