Try something

Author: JOJ0

beetsplug/lastgenre/__init__.py

@@ -90,25 +90,25 @@ def find_parents(candidate, branches):
 
 
 def split_on_separators(text, separators):
-    """Split text on multiple separators using regex.
-
-    Separators are expected to be defined without whitespace, but during
-    matching, leading and trailing whitespace around separators is ignored.
-
-    Returns a list of stripped text parts, or [text] if no separators found
-    """
-    # Check each separator individually first
-    for sep in separators:
-        # Create pattern with optional whitespace around separator
-        pattern = f"\\s*{sep}\\s*"
-        if re.search(pattern, text):
-            # Found a separator, split on it
-            parts = re.split(pattern, text)
-            result = [part.strip() for part in parts if part.strip()]
-            return result
-
-    # No separators found
-    return [text]
+    """Split text on configured separators; returns [text] if none."""
+    # Normalize and drop empty/whitespace-only separators
+    if isinstance(separators, str):
+        seps = [separators]
+    else:
+        seps = list(separators or [])
+    seps = [s for s in seps if isinstance(s, str) and s.strip()]
+    if not seps:
+        return [text]
+
+    # One regex: separators at token boundaries (no letters/digits touching)
+    # (?<!\S) == start or whitespace; (?!\S) == end or whitespace
+    alt = "|".join(re.escape(s) for s in seps)  # escape special chars
+    pattern = rf"(?<!\S)(?:{alt})(?!\S)"
+
+    if not re.search(pattern, text, flags=re.IGNORECASE):
+        return [text]
+    parts = re.split(pattern, text, flags=re.IGNORECASE)
+    return [p.strip() for p in parts if p.strip()]
 
 
 # Main plugin logic.