I have a compromise idea, here is some points:
1, Create a built-in class `pattern_str` which is a subclass of `str`,
it's dedicated to regex pattern string.
2, Use p"" to represent `pattern_str`.
Some advantages:
1, Since it's a subclass of `str`, we can use it as normal `str`.
2, IDE/linter/compiler can identify it as an regex pattern, something
like type hint in language level.
3, We can still store compiled pattern in .pyc file *quietly*.
4, Won't introduce Perl style into Python, to avoid abusing regex in
some degree.
We still using regex in the old way:
import re
re.search(p"(?i)[a-z]", s)
But if re.search() find the pattern is a `pattern_str`, it load compiled
pattern from .pyc file directly.
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