Update

Author: dantleech

src/Util/FileMatcher.php

@@ -61,8 +61,8 @@ public static function toRegEx($glob, $flags = 0): string
                     $regex .= '-';
                     break;
                 case '!':
-                    // complementation/negation
-                    if ($glob[$i - 1] === '[') {
+                    // complementation/negation: taking into account escaped square brackets
+                    if ($glob[$i - 1] === '[' && ($glob[$i - 2] !== '\\' || ($glob[$i -2] === '\\' && $glob[$i - 3] === '\\'))) {
                         $regex .= '^';
                         break;
                     }
@@ -131,6 +131,7 @@ public static function toRegEx($glob, $flags = 0): string
 
         $regex .= '(/|$)';
 
+        dump($regex);
         return '{^'.$regex.'}';
     }
 

tests/unit/Util/FileMatcherTest.php

@@ -493,7 +493,12 @@ public static function provideCharacterGroup(): Generator
                 '/a/[!a-c]/c/d' => true,
                 '/b/[!a-c]/c/d' => false,
             ],
-            'Regex escaping',
+        ];
+        yield 'literal backslash neagted group' => [
+            new FileMatcherPattern('/a/\\\[!a-c]/c'),
+            [
+                '/a/\\d/c' => true,
+            ],
         ];
 
         // TODO: test all the character clases