SedRegex: Make pattern case-insensitive.

To fixes a mismatch between callbacks, which use flags=re.I by default,
and SED_REGEX.search which isn't; so 'S/foo/bar/' errored because it
matches case-insensitively so _unpack_sed is entered, but then _unpack_sed
fails to match it case-sensitively.

plugins/SedRegex/plugin.py

@@ -53,7 +53,8 @@ if sys.version_info[0] < 3:
                       'https://github.com/jlu5/SupyPlugins/tree/python2-legacy')
 
 SED_REGEX = re.compile(r"^(?:(?P<nick>.+?)[:,] )?s(?P<delim>[^\w\s])(?P<pattern>.*?)(?P=delim)"
-                       r"(?P<replacement>.*?)(?P=delim)(?P<flags>[a-z]*)$")
+                       r"(?P<replacement>.*?)(?P=delim)(?P<flags>[a-z]*)$",
+                       re.I)
 
 # Replace newlines and friends with things like literal "\n" (backslash and "n")
 axe_spaces = utils.str.MultipleReplacer({'\n': '\\n', '\t': '\\t', '\r': '\\r'})
@@ -85,15 +86,12 @@ class SedRegex(callbacks.PluginRegexp):
 
         match = SED_REGEX.search(escaped_expr)
 
-        if not match:
-            return
-
         groups = match.groupdict()
         pattern = groups['pattern'].replace('\0', delim)
         replacement = groups['replacement'].replace('\0', delim)
 
         if groups['flags']:
-            raw_flags = set(groups['flags'])
+            raw_flags = set(groups['flags'].lower())
         else:
             raw_flags = set()
 

plugins/SedRegex/test.py

@@ -51,6 +51,12 @@ class SedRegexTestCase(ChannelPluginTestCase):
         m = self.getMsg(' ')
         self.assertIn('Abcd testefgh', str(m))
 
+    def testCaseInsensitiveRegexp(self):
+        self.feedMsg('aliens are invading, help!')
+        self.feedMsg('S/a/e/i')
+        m = self.getMsg(' ')
+        self.assertIn('eliens', str(m))
+
     def testCaseInsensitiveReplace(self):
         self.feedMsg('Aliens Are Invading, Help!')
         self.feedMsg('s/a/e/i')