Use Re() for creating regular expressions

It's a fairly common pattern to use regular expression in our tests.
Instead of using the fairly verbose re.compile(), import that function
as Re() instead to allow for more brevity in the test syntax.

(cherry picked from commit ac7127d620)

bin/tests/system/cipher-suites/tests_cipher_suites.py

@@ -9,7 +9,7 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-import re
+from re import compile as Re
 
 import pytest
 
@@ -31,7 +31,7 @@ pytestmark = pytest.mark.extra_artifacts(
 @pytest.fixture(scope="module")
 def transfers_complete(servers):
     for zone in ["example", "example-aes-128", "example-aes-256", "example-chacha-20"]:
-        pattern = re.compile(
+        pattern = Re(
             f"transfer of '{zone}/IN' from 10.53.0.1#[0-9]+: Transfer completed"
         )
         for ns in ["ns2", "ns3", "ns4", "ns5"]:

bin/tests/system/conftest.py

@@ -12,7 +12,7 @@
 import filecmp
 import os
 from pathlib import Path
-import re
+from re import compile as Re
 import shutil
 import subprocess
 import tempfile
@@ -53,7 +53,7 @@ else:
 
 XDIST_WORKER = os.environ.get("PYTEST_XDIST_WORKER", "")
 FILE_DIR = os.path.abspath(Path(__file__).parent)
-ENV_RE = re.compile(b"([^=]+)=(.*)")
+ENV_RE = Re(b"([^=]+)=(.*)")
 PRIORITY_TESTS = [
     # Tests that are scheduled first. Speeds up parallel execution.
     "rpz/",
@@ -62,9 +62,9 @@ PRIORITY_TESTS = [
     "timeouts/",
     "upforwd/",
 ]
-PRIORITY_TESTS_RE = re.compile("|".join(PRIORITY_TESTS))
-SYSTEM_TEST_NAME_RE = re.compile(f"{SYSTEM_TEST_DIR_GIT_PATH}" + r"/([^/]+)")
-SYMLINK_REPLACEMENT_RE = re.compile(r"/tests(_.*)\.py")
+PRIORITY_TESTS_RE = Re("|".join(PRIORITY_TESTS))
+SYSTEM_TEST_NAME_RE = Re(f"{SYSTEM_TEST_DIR_GIT_PATH}" + r"/([^/]+)")
+SYMLINK_REPLACEMENT_RE = Re(r"/tests(_.*)\.py")
 
 # ----------------------- Global requirements ----------------------------
 

bin/tests/system/isctest/kasp.py

@@ -15,6 +15,7 @@ import glob
 import os
 from pathlib import Path
 import re
+from re import compile as Re
 import time
 from typing import Dict, List, Optional, Tuple, Union
 
@@ -1453,7 +1454,7 @@ def next_key_event_equals(server, zone, next_event):
         waitfor = rf".*zone {zone}.*: next key event in (?!3600$)(.*) seconds"
 
     with server.watch_log_from_start() as watcher:
-        watcher.wait_for_line(re.compile(waitfor))
+        watcher.wait_for_line(Re(waitfor))
 
     # WMM: The with code below is extracting the line the watcher was
     # waiting for. If WatchLog.wait_for_line()` returned the matched string,

bin/tests/system/isctest/log/watchlog.py

@@ -14,6 +14,7 @@ from typing import Any, Iterator, List, Match, Optional, Pattern, TextIO, TypeVa
 import abc
 import os
 import re
+from re import compile as Re
 import time
 
 
@@ -213,7 +214,7 @@ class WatchLog(abc.ABC):
             if isinstance(string, Pattern):
                 patterns.append(string)
             elif isinstance(string, str):
-                pattern = re.compile(re.escape(string))
+                pattern = Re(re.escape(string))
                 patterns.append(pattern)
             else:
                 raise WatchLogException(
@@ -256,13 +257,14 @@ class WatchLog(abc.ABC):
         Recommended use:
 
         ```python
+        from re import compile as Re
         import isctest
 
         def test_foo(servers):
             with servers["ns1"].watch_log_from_start() as watcher:
                 watcher.wait_for_line("all zones loaded")
 
-            pattern = re.compile(r"next key event in ([0-9]+) seconds")
+            pattern = Re(r"next key event in ([0-9]+) seconds")
             with servers["ns1"].watch_log_from_here() as watcher:
                 # ... do stuff here ...
                 match = watcher.wait_for_line(pattern)
@@ -321,7 +323,8 @@ class WatchLog(abc.ABC):
         >>> # Different values must be returned depending on which line is
         >>> # found in the log file.
         >>> import tempfile
-        >>> patterns = [re.compile(r"bar ([0-9])"), "qux"]
+        >>> from re import compile as Re
+        >>> patterns = [Re(r"bar ([0-9])"), "qux"]
         >>> with tempfile.NamedTemporaryFile("w") as file:
         ...     print("foo bar 3", file=file, flush=True)
         ...     with WatchLogFromStart(file.name) as watcher:
@@ -443,7 +446,8 @@ class WatchLog(abc.ABC):
         >>> assert ret[1].group(0) == "foo"
 
         >>> import tempfile
-        >>> bar_pattern = re.compile('bar')
+        >>> from re import compile as Re
+        >>> bar_pattern = Re('bar')
         >>> patterns = ['foo', bar_pattern]
         >>> with tempfile.NamedTemporaryFile("w") as file:
         ...     print("bar", file=file, flush=True)

bin/tests/system/isctest/vars/openssl.py

@@ -10,7 +10,7 @@
 # information regarding copyright ownership.
 
 import os
-import re
+from re import compile as Re
 from typing import Optional
 
 from .. import log
@@ -33,7 +33,7 @@ def parse_openssl_config(path: Optional[str]):
         return
     assert os.path.isfile(path), f"{path} exists, but it's not a file"
 
-    regex = re.compile(r"([^=]+)=(.*)")
+    regex = Re(r"([^=]+)=(.*)")
     log.debug(f"parsing openssl config: {path}")
     with open(path, "r", encoding="utf-8") as conf:
         for line in conf:

bin/tests/system/multisigner/tests_multisigner.py

@@ -12,6 +12,7 @@
 from datetime import timedelta
 import os
 import re
+from re import compile as Re
 
 import pytest
 
@@ -103,9 +104,7 @@ def check_no_dnssec_in_journal(server, zone):
     ]
 
     cmd = isctest.run.cmd(journalprint)
-    pattern = re.compile(
-        r"^\s*(?:\S+\s+){4}(NSEC|NSEC3|NSEC3PARAM|RRSIG)", flags=re.MULTILINE
-    )
+    pattern = Re(r"^\s*(?:\S+\s+){4}(NSEC|NSEC3|NSEC3PARAM|RRSIG)", flags=re.MULTILINE)
     match = pattern.search(cmd.out)
     assert not match, f"{match.group(1)} record found in journal"
 

bin/tests/system/xfer-servers-list/tests_xfer_servers_list.py

@@ -9,7 +9,7 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-import re
+from re import compile as Re
 
 import isctest
 
@@ -32,7 +32,7 @@ def wait_for_initial_xfrin(ns):
 
 
 def wait_for_sending_notify(ns1, ns, key_name):
-    pattern = re.compile(
+    pattern = Re(
         f"zone test/IN: sending notify to {ns.ip}#[0-9]+ : TSIG \\({key_name}\\)"
     )
     with ns1.watch_log_from_start() as watcher:

bin/tests/system/xferquota/tests_xferquota.py

@@ -12,6 +12,7 @@
 import glob
 import os
 import re
+from re import compile as Re
 import shutil
 import signal
 import time
@@ -71,7 +72,7 @@ def test_xferquota(named_port, ns1, ns2):
         isctest.check.rrsets_equal(ns1response.answer, ns2response.answer)
 
     query_and_compare(axfr_msg)
-    pattern = re.compile(
+    pattern = Re(
         f"transfer of 'changing/IN' from 10.53.0.1#{named_port}: "
         f"Transfer completed: .*\\(serial 2\\)"
     )