AIX: improve open_files() regexp speed (#2457)

CREDITS

@@ -835,3 +835,8 @@ I: 2272
 N: Sam Gross
 W: https://github.com/colesbury
 I: 2401, 2427
+
+N: Aleksey Lobanov
+C: Russia
+E: [email protected]
+W: https://github.com/AlekseyLobanov

HISTORY.rst

@@ -25,6 +25,8 @@ XXXX-XX-XX
   Python 3.13.  (patch by Sam Gross)
 - 2455_, [Linux]: ``IndexError`` may occur when reading /proc/pid/stat and
   field 40 (blkio_ticks) is missing.
+- 2457_, [AIX]: significantly improve the speed of `Process.open_files()`_ for 
+  some edge cases.
 - 2460_, [OpenBSD]: `Process.num_fds()`_ and `Process.open_files()`_ may fail
   with `NoSuchProcess`_ for PID 0. Instead, we now return "null" values (0 and
   [] respectively).

psutil/_psaix.py

@@ -539,7 +539,7 @@ def open_files(self):
             )
         if "no such process" in stderr.lower():
             raise NoSuchProcess(self.pid, self._name)
-        procfiles = re.findall(r"(\d+): S_IFREG.*\s*.*name:(.*)\n", stdout)
+        procfiles = re.findall(r"(\d+): S_IFREG.*name:(.*)\n", stdout)
         retlist = []
         for fd, path in procfiles:
             path = path.strip()