Replace sed call

autokara/preprocess/lyrics.py

@@ -3,6 +3,8 @@ import argparse
 import subprocess
 import shlex
 from pathlib import Path
+import re
+
 
 
 
@@ -12,7 +14,9 @@ def extract_subtitles(source_file, output_file=None):
     else:
         out_path = output_file
     
-    data = subprocess.run(f'mkvmerge --identify "{source_file:s}" | sed -n "s/Track ID \\([[:digit:]]*\\).*subtitles.*/\\1/p"', capture_output=True, shell=True, text=True)
-    track_id = data.stdout.rstrip()
+    data = subprocess.run(f'mkvmerge --identify "{source_file:s}"', capture_output=True, shell=True, text=True)
+    RGX_TRACK = re.compile(r"Track ID (\d+): subtitles")
+    matches = RGX_TRACK.findall(data.stdout)
+    track_id = matches[0][0]
     
     subprocess.call(shlex.split(f'mkvextract "{source_file:s}" tracks "{track_id:s}":"{out_path:s}"'))
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