[BUGFIX] Use the safe regexp functions in Selector

Part of #1168

Author: oliverklee

src/Property/Selector.php

@@ -8,6 +8,8 @@
 use Sabberworm\CSS\Property\Selector\SpecificityCalculator;
 use Sabberworm\CSS\Renderable;
 
+use function Safe\preg_match;
+
 /**
  * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this
  * class.
@@ -42,7 +44,7 @@ class Selector implements Renderable
     public static function isValid(string $selector): bool
     {
         // Note: We need to use `static::` here as the constant is overridden in the `KeyframeSelector` class.
-        $numberOfMatches = \preg_match(static::SELECTOR_VALIDATION_RX, $selector);
+        $numberOfMatches = preg_match(static::SELECTOR_VALIDATION_RX, $selector);
 
         return $numberOfMatches === 1;
     }

tests/ParserTest.php

@@ -73,11 +73,7 @@ public function files(): void
                     continue;
                 }
                 $parser = new Parser(\file_get_contents($directory . '/' . $filename));
-                try {
-                    self::assertNotEquals('', $parser->parse()->render());
-                } catch (\Exception $e) {
-                    self::fail($e);
-                }
+                self::assertNotSame('', $parser->parse()->render());
             }
             \closedir($directoryHandle);
         }