diff --git a/src/ShellCheck/AnalyzerLib.hs b/src/ShellCheck/AnalyzerLib.hs
index 0640da2..70b781e 100644
--- a/src/ShellCheck/AnalyzerLib.hs
+++ b/src/ShellCheck/AnalyzerLib.hs
@@ -791,7 +791,7 @@ isCommandMatch token matcher = fromMaybe False $
 -- False: .*foo.*
 isConfusedGlobRegex :: String -> Bool
 isConfusedGlobRegex ('*':_) = True
-isConfusedGlobRegex [x,'*'] | x /= '\\' = True
+isConfusedGlobRegex [x,'*'] | x `notElem` "\\." = True
 isConfusedGlobRegex _       = False
 
 isVariableStartChar x = x == '_' || isAsciiLower x || isAsciiUpper x
diff --git a/src/ShellCheck/Checks/Commands.hs b/src/ShellCheck/Checks/Commands.hs
index c95720a..f684130 100644
--- a/src/ShellCheck/Checks/Commands.hs
+++ b/src/ShellCheck/Checks/Commands.hs
@@ -214,6 +214,9 @@ prop_checkGrepRe17= verifyNot checkGrepRe "grep --exclude 'Foo*' file"
 prop_checkGrepRe18= verifyNot checkGrepRe "grep --exclude-dir 'Foo*' file"
 prop_checkGrepRe19= verify checkGrepRe "grep -- 'Foo*' file"
 prop_checkGrepRe20= verifyNot checkGrepRe "grep --fixed-strings 'Foo*' file"
+prop_checkGrepRe21= verifyNot checkGrepRe "grep -o 'x*' file"
+prop_checkGrepRe22= verifyNot checkGrepRe "grep --only-matching 'x*' file"
+prop_checkGrepRe23= verifyNot checkGrepRe "grep '.*' file"
 
 checkGrepRe = CommandCheck (Basename "grep") check where
     check cmd = f cmd (arguments cmd)
@@ -246,7 +249,7 @@ checkGrepRe = CommandCheck (Basename "grep") check where
                     "Note that unlike globs, " ++ [char] ++ "* here matches '" ++ [char, char, char] ++ "' but not '" ++ wordStartingWith char ++ "'."
       where
         flags = map snd $ getAllFlags cmd
-        grepGlobFlags = ["fixed-strings", "F", "include", "exclude", "exclude-dir"]
+        grepGlobFlags = ["fixed-strings", "F", "include", "exclude", "exclude-dir", "o", "only-matching"]
 
     wordStartingWith c =
         head . filter ([c] `isPrefixOf`) $ candidates