diff --git a/django/contrib/staticfiles/storage.py b/django/contrib/staticfiles/storage.py
index dfca0f4a2d..e97355831b 100644
--- a/django/contrib/staticfiles/storage.py
+++ b/django/contrib/staticfiles/storage.py
@@ -42,15 +42,21 @@ class StaticFilesStorage(FileSystemStorage):
 
 
 class HashedFilesMixin:
-    default_template = """url("%s")"""
+    default_template = """url("%(url)s")"""
     max_post_process_passes = 5
     patterns = (
         ("*.css", (
-            r"""(url\(['"]{0,1}\s*(.*?)["']{0,1}\))""",
-            (r"""(@import\s*["']\s*(.*?)["'])""", """@import url("%s")"""),
+            r"""(?P<matched>url\(['"]{0,1}\s*(?P<url>.*?)["']{0,1}\))""",
+            (
+                r"""(?P<matched>@import\s*["']\s*(?P<url>.*?)["'])""",
+                """@import url("%(url)s")""",
+            ),
         )),
         ('*.js', (
-            (r'(?m)^(//# (?-i:sourceMappingURL)=(.*))$', '//# sourceMappingURL=%s'),
+            (
+                r'(?P<matched>)^(//# (?-i:sourceMappingURL)=(?P<url>.*))$',
+                '//# sourceMappingURL=%(url)s',
+            ),
         )),
     )
     keep_intermediate_files = True
@@ -163,7 +169,9 @@ class HashedFilesMixin:
             This requires figuring out which files the matched URL resolves
             to and calling the url() method of the storage.
             """
-            matched, url = matchobj.groups()
+            matches = matchobj.groupdict()
+            matched = matches['matched']
+            url = matches['url']
 
             # Ignore absolute/protocol-relative and data-uri URLs.
             if re.match(r'^[a-z]+:', url):
@@ -199,7 +207,8 @@ class HashedFilesMixin:
                 transformed_url += ('?#' if '?#' in url else '#') + fragment
 
             # Return the hashed version to the file
-            return template % unquote(transformed_url)
+            matches['url'] = unquote(transformed_url)
+            return template % matches
 
         return converter
 
diff --git a/tests/staticfiles_tests/storage.py b/tests/staticfiles_tests/storage.py
index 05fdec8db2..e94534fff0 100644
--- a/tests/staticfiles_tests/storage.py
+++ b/tests/staticfiles_tests/storage.py
@@ -84,7 +84,10 @@ class ExtraPatternsStorage(ManifestStaticFilesStorage):
     patterns = tuple(ManifestStaticFilesStorage.patterns) + (
         (
             "*.js", (
-                (r"""(url\(['"]{0,1}\s*(.*?)["']{0,1}\))""", 'JS_URL("%s")'),
+                (
+                    r"""(?P<matched>url\(['"]{0,1}\s*(?P<url>.*?)["']{0,1}\))""",
+                    'JS_URL("%(url)s")',
+                ),
             ),
         ),
     )