diff --git a/packages/Autodiscovery/src/Rector/FileSystem/MoveServicesBySuffixToDirectoryRector.php b/packages/Autodiscovery/src/Rector/FileSystem/MoveServicesBySuffixToDirectoryRector.php
index 48a2898d6c3..6693102b8f0 100644
--- a/packages/Autodiscovery/src/Rector/FileSystem/MoveServicesBySuffixToDirectoryRector.php
+++ b/packages/Autodiscovery/src/Rector/FileSystem/MoveServicesBySuffixToDirectoryRector.php
@@ -94,7 +94,11 @@ PHP
             }
 
             // is suffix in the same category, e.g. "Exception/SomeException.php"
-            $expectedLocationFilePattern = sprintf('#\/%s\/.+%s#', preg_quote($groupName), preg_quote($suffixPattern));
+            $expectedLocationFilePattern = sprintf(
+                '#\/%s\/.+%s#',
+                preg_quote($groupName, '#'),
+                preg_quote($suffixPattern, '#')
+            );
             if (Strings::match($smartFileInfo->getRealPath(), $expectedLocationFilePattern)) {
                 continue;
             }
diff --git a/packages/BetterPhpDocParser/src/PhpDocParser/ClassAnnotationMatcher.php b/packages/BetterPhpDocParser/src/PhpDocParser/ClassAnnotationMatcher.php
index f62a3ad7deb..5f20fce027d 100644
--- a/packages/BetterPhpDocParser/src/PhpDocParser/ClassAnnotationMatcher.php
+++ b/packages/BetterPhpDocParser/src/PhpDocParser/ClassAnnotationMatcher.php
@@ -36,7 +36,7 @@ final class ClassAnnotationMatcher
     private function isUseMatchingName(string $tag, UseUse $useUse): bool
     {
         $shortName = $useUse->alias ? $useUse->alias->name : $useUse->name->getLast();
-        $shortNamePattern = preg_quote($shortName);
+        $shortNamePattern = preg_quote($shortName, '#');
 
         return (bool) Strings::match($tag, '#' . $shortNamePattern . '(\\\\[\w]+)?#i');
     }
diff --git a/packages/CodeQuality/src/Rector/FuncCall/AddPregQuoteDelimiterRector.php b/packages/CodeQuality/src/Rector/FuncCall/AddPregQuoteDelimiterRector.php
index 181e54bdfbc..b523ca10ca4 100644
--- a/packages/CodeQuality/src/Rector/FuncCall/AddPregQuoteDelimiterRector.php
+++ b/packages/CodeQuality/src/Rector/FuncCall/AddPregQuoteDelimiterRector.php
@@ -5,7 +5,9 @@ declare(strict_types=1);
 namespace Rector\CodeQuality\Rector\FuncCall;
 
 use PhpParser\Node;
+use PhpParser\Node\Arg;
 use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Scalar\String_;
 use Rector\Rector\AbstractRector;
 use Rector\RectorDefinition\CodeSample;
 use Rector\RectorDefinition\RectorDefinition;
@@ -65,7 +67,7 @@ PHP
             return null;
         }
 
-        $node->args[1] = new Node\Arg(new Node\Scalar\String_('#'));
+        $node->args[1] = new Arg(new String_('#'));
 
         return $node;
     }
diff --git a/packages/NodeTypeResolver/src/PhpDoc/NodeAnalyzer/DocBlockNameImporter.php b/packages/NodeTypeResolver/src/PhpDoc/NodeAnalyzer/DocBlockNameImporter.php
index 0cfed5da1a3..701022707a2 100644
--- a/packages/NodeTypeResolver/src/PhpDoc/NodeAnalyzer/DocBlockNameImporter.php
+++ b/packages/NodeTypeResolver/src/PhpDoc/NodeAnalyzer/DocBlockNameImporter.php
@@ -197,8 +197,8 @@ final class DocBlockNameImporter
         // short with space " Type"| fqn
         $shortNameOrFullyQualifiedNamePattern = sprintf(
             '#(\s%s\b|\b%s\b)#',
-            preg_quote($shortenedObjectType->getShortName()),
-            preg_quote($fullyQualifiedName)
+            preg_quote($shortenedObjectType->getShortName(), '#'),
+            preg_quote($fullyQualifiedName, '#')
         );
 
         $isShortClassUsed = (bool) Strings::match($printedClass, $shortNameOrFullyQualifiedNamePattern);
diff --git a/packages/PHPUnit/src/Rector/TryCatchToExpectExceptionRector.php b/packages/PHPUnit/src/Rector/TryCatchToExpectExceptionRector.php
index 639ed5b2176..11614fb560f 100644
--- a/packages/PHPUnit/src/Rector/TryCatchToExpectExceptionRector.php
+++ b/packages/PHPUnit/src/Rector/TryCatchToExpectExceptionRector.php
@@ -248,7 +248,7 @@ PHP
         if ($methodCall->args[0]->value instanceof String_) {
             /** @var String_ $oldString */
             $oldString = $methodCall->args[0]->value;
-            $methodCall->args[0]->value = new String_('#' . preg_quote($oldString->value) . '#');
+            $methodCall->args[0]->value = new String_('#' . preg_quote($oldString->value, '#') . '#');
         }
 
         $this->newExpressions[] = $expression;
diff --git a/rector.yaml b/rector.yaml
index 4db7b1ec053..811830f47bb 100644
--- a/rector.yaml
+++ b/rector.yaml
@@ -18,4 +18,5 @@ parameters:
     php_version_features: '7.1'
 
 services:
-    Rector\PHPUnit\Rector\ClassMethod\AddDoesNotPerformAssertionToNonAssertingTestRector: ~
+    Rector\CodeQuality\Rector\FuncCall\AddPregQuoteDelimiterRector: ~
+#    Rector\PHPUnit\Rector\ClassMethod\AddDoesNotPerformAssertionToNonAssertingTestRector: ~