fix windows path issues in parse_lammps_dumps()

pymatgen/io/lammps/outputs.py

@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+import os
 import re
 from glob import glob
 from io import StringIO
@@ -108,11 +109,12 @@ def parse_lammps_dumps(file_pattern):
 
     Yields:
         LammpsDump for each available snapshot.
-
     """
     files = glob(file_pattern)
     if len(files) > 1:
-        pattern = file_pattern.replace("*", "([0-9]+)").replace("\\", "\\\\")
+        pattern = file_pattern.replace("*", "([0-9]+)")
+        pattern = os.path.normpath(pattern)  # normalize the path separator
+        pattern = re.escape(pattern)  # escape special regex characters
         files = sorted(files, key=lambda f: int(re.match(pattern, f).group(1)))
 
     for fname in files:
@@ -144,7 +146,6 @@ def parse_lammps_log(filename="log.lammps"):
 
     Returns:
         [pd.DataFrame] containing thermo data for each completed run.
-
     """
     with zopen(filename, "rt") as f:
         lines = f.readlines()