diff --git a/packaging_scripts/pkgfiles.py b/packaging_scripts/pkgfiles.py
index 0f6a18a..eab873f 100644
--- a/packaging_scripts/pkgfiles.py
+++ b/packaging_scripts/pkgfiles.py
@@ -1,37 +1,50 @@
 """Helper functions for dealing with package files."""
 
-import glob
-import os
-import os.path
+import re
+
+from pathlib import Path
 
 # ========== Constants ==========
-PKGEXT = "pkg.tar.xz"
-SIGEXT = f"{PKGEXT}.sig"
+# Match any pkgfile of any name with the .pkg.tar.* extension
+PKGREGEX = "^[\w]+[.]pkg[.]tar([.][\w]+)?$"
+# Match any sigfile of any name with the .pkg.tar.*.sig extension
+SIGREGEX = "^[\w]+[.]pkg[.]tar[.][\w]*[.]sig$"
 
 
 # ========== Functions ==========
-def get_pkgfiles(query=None, directory=None, *, signatures_only=False):
+def get_pkgfiles(query=None, *, directory=None, signatures_only=False):
     """Return a list of package files in the current working directory.
 
     :param query: names of package files to search for
     :type query: str
     :param directory: a directory to search in
-    :type directory: str
+    :type directory: str or path-like object
     :param signatures_only: include only signature files
     :type signatures_only: bool
     :returns: paths of package files
     :rtype: list
     """
-    if directory is not None:
-        path = directory
-    else:
-        path = os.getcwd()
+    path = Path.cwd() if directory is None else Path(directory)
+    filequery = f"*{query}*" if query is not None else "*"
 
-    if signatures_only and query is not None:
-        return glob.glob(f"{path}/*{query}*.{SIGEXT}")
-    elif signatures_only and query is None:
-        return glob.glob(f"{path}/*.{SIGEXT}")
-    elif not signatures_only and query is not None:
-        return glob.glob(f"{path}/*{query}*.{PKGEXT}")
-    elif not signatures_only and query is None:
-        return glob.glob(f"{path}/*.{PKGEXT}")
+    if signatures_only:
+        yield from _filter_by_regex(filequery, SIGREGEX, path)
+    else:
+        yield from _filter_by_regex(filequery, PKGREGEX, path)
+
+
+def _filter_by_regex(query, regex_expression, path):
+    """Filter package files only.
+
+    :param query: names of package files to search for
+    :type query: str
+    :param regex_expression: the expression to filter by
+    :type regex_expression: str
+    :param path: directory to look for files
+    :type path: path-like object
+    :yields: package files from either the current working directory
+        or an arbitrary directory
+    """
+    for pkgfile in path.glob(query):
+        if re.match(regex_expression, str(pkgfile)):
+            yield pkgfile