[Python-checkins] Add more tests for inline flag "x" and re.VERBOSE (GH-91854)

[miss-islington]

https://github.com/python/cpython/commit/4165702ee89d2b90531f36e04374cfeb2016f1fd
commit: 4165702ee89d2b90531f36e04374cfeb2016f1fd
branch: 3.9
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2022-04-23T03:16:50-07:00
summary:

RE: Add more tests for inline flag "x" and re.VERBOSE (GH-91854)

(cherry picked from commit 6b45076bd62407103433daea8acf085a99e6cb7e)

Co-authored-by: Serhiy Storchaka <storchaka at gmail.com>

files:
M Lib/test/test_re.py

diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index ca48b9b11f2a8..c779057bc1dd5 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -1682,11 +1682,6 @@ def test_scoped_flags(self):
         self.assertIsNone(re.match(r'(?i:(?-i:a)b)', 'Ab'))
         self.assertTrue(re.match(r'(?i:(?-i:a)b)', 'aB'))
 
-        self.assertTrue(re.match(r'(?x: a) b', 'a b'))
-        self.assertIsNone(re.match(r'(?x: a) b', ' a b'))
-        self.assertTrue(re.match(r'(?-x: a) b', ' ab', re.VERBOSE))
-        self.assertIsNone(re.match(r'(?-x: a) b', 'ab', re.VERBOSE))
-
         self.assertTrue(re.match(r'\w(?a:\W)\w', '\xe0\xe0\xe0'))
         self.assertTrue(re.match(r'(?a:\W(?u:\w)\W)', '\xe0\xe0\xe0'))
         self.assertTrue(re.match(r'\W(?u:\w)\W', '\xe0\xe0\xe0', re.ASCII))
@@ -1712,6 +1707,33 @@ def test_scoped_flags(self):
         self.checkPatternError(r'(?i+', 'missing -, : or )', 3)
         self.checkPatternError(r'(?iz', 'unknown flag', 3)
 
+    def test_ignore_spaces(self):
+        for space in " \t\n\r\v\f":
+            self.assertTrue(re.fullmatch(space + 'a', 'a', re.VERBOSE))
+        for space in b" ", b"\t", b"\n", b"\r", b"\v", b"\f":
+            self.assertTrue(re.fullmatch(space + b'a', b'a', re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x) a', 'a'))
+        self.assertTrue(re.fullmatch(' (?x) a', 'a', re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x) (?x) a', 'a'))
+        self.assertTrue(re.fullmatch(' a(?x: b) c', ' ab c'))
+        self.assertTrue(re.fullmatch(' a(?-x: b) c', 'a bc', re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x) a(?-x: b) c', 'a bc'))
+        self.assertTrue(re.fullmatch('(?x) a| b', 'a'))
+        self.assertTrue(re.fullmatch('(?x) a| b', 'b'))
+
+    def test_comments(self):
+        self.assertTrue(re.fullmatch('#x\na', 'a', re.VERBOSE))
+        self.assertTrue(re.fullmatch(b'#x\na', b'a', re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x)#x\na', 'a'))
+        self.assertTrue(re.fullmatch('#x\n(?x)#y\na', 'a', re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x)#x\n(?x)#y\na', 'a'))
+        self.assertTrue(re.fullmatch('#x\na(?x:#y\nb)#z\nc', '#x\nab#z\nc'))
+        self.assertTrue(re.fullmatch('#x\na(?-x:#y\nb)#z\nc', 'a#y\nbc',
+                                     re.VERBOSE))
+        self.assertTrue(re.fullmatch('(?x)#x\na(?-x:#y\nb)#z\nc', 'a#y\nbc'))
+        self.assertTrue(re.fullmatch('(?x)#x\na|#y\nb', 'a'))
+        self.assertTrue(re.fullmatch('(?x)#x\na|#y\nb', 'b'))
+
     def test_bug_6509(self):
         # Replacement strings of both types must parse properly.
         # all strings