gh-141968: Use take_bytes in re._compiler (#141995)

cmaloney · vstinner · picnixz · web-flow · commit 3001464248ed · 2025-11-28T17:46:10.000Z
Removes a copy going from bytearray to bytes.

Co-authored-by: Victor Stinner &lt;vstinner@python.org&gt;
Co-authored-by: Bénédikt Tran &lt;10796600+picnixz@users.noreply.github.com&gt;
diff --git a/Lib/re/_compiler.py b/Lib/re/_compiler.py
@@ -375,7 +375,7 @@ def _optimize_charset(charset, iscased=None, fixup=None, fixes=None):
     # less significant byte is a bit index in the chunk (just like the
     # CHARSET matching).
 
-    charmap = bytes(charmap) # should be hashable
+    charmap = charmap.take_bytes() # should be hashable
     comps = {}
     mapping = bytearray(256)
     block = 0
diff --git a/Misc/NEWS.d/next/Library/2025-11-26-14-20-10.gh-issue-141968.W139Pv.rst b/Misc/NEWS.d/next/Library/2025-11-26-14-20-10.gh-issue-141968.W139Pv.rst
@@ -0,0 +1,2 @@
+Remove data copy from :mod:`re` compilation of regexes with large charsets
+by using :meth:`bytearray.take_bytes`.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Remove data copy from :mod:`re` compilation of regexes with large charsets
	`2`	+by using :meth:`bytearray.take_bytes`.