Implement pygrep language as a replacement for pcre

testing/fixtures.py

@@ -73,7 +73,7 @@ def config_with_local_hooks():
                 ('id', 'do_not_commit'),
                 ('name', 'Block if "DO NOT COMMIT" is found'),
                 ('entry', 'DO NOT COMMIT'),
-                ('language', 'pcre'),
+                ('language', 'pygrep'),
                 ('files', '^(.*)$'),
             ))],
         ),

testing/resources/pcre_hooks_repo/.pre-commit-hooks.yaml

@@ -1,16 +0,0 @@
--   id: regex-with-quotes
-    name: Regex with quotes
-    entry: "foo'bar"
-    language: pcre
-    files: ''
--   id: other-regex
-    name: Other regex
-    entry: ^\[INFO\]
-    language: pcre
-    files: ''
--   id: regex-with-grep-args
-    name: Regex with grep extra arguments
-    entry: foo.+bar
-    language: pcre
-    files: ''
-    args: [-i]