SqliteSchemaManager: Drop unnecessary `x` PCRE modifier

lib/Doctrine/DBAL/Schema/SqliteSchemaManager.php

@@ -438,7 +438,7 @@ class SqliteSchemaManager extends AbstractSchemaManager
     private function parseColumnCollationFromSQL(string $column, string $sql) : ?string
     {
         $pattern = '{(?:\W' . preg_quote($column) . '\W|\W' . preg_quote($this->_platform->quoteSingleIdentifier($column))
-                 . '\W)[^,(]+(?:\([^()]+\)[^,]*)?(?:(?:DEFAULT|CHECK)\s*(?:\(.*?\))?[^,]*)*COLLATE\s+["\']?([^\s,"\')]+)}isx';
+            . '\W)[^,(]+(?:\([^()]+\)[^,]*)?(?:(?:DEFAULT|CHECK)\s*(?:\(.*?\))?[^,]*)*COLLATE\s+["\']?([^\s,"\')]+)}is';
 
         if (preg_match($pattern, $sql, $match) !== 1) {
             return null;
@@ -450,7 +450,7 @@ class SqliteSchemaManager extends AbstractSchemaManager
     private function parseColumnCommentFromSQL(string $column, string $sql) : ?string
     {
         $pattern = '{[\s(,](?:\W' . preg_quote($this->_platform->quoteSingleIdentifier($column)) . '\W|\W' . preg_quote($column)
-                 . '\W)(?:\(.*?\)|[^,(])*?,?((?:(?!\n))(?:\s*--[^\n]*\n?)+)}ix';
+            . '\W)(?:\(.*?\)|[^,(])*?,?((?:(?!\n))(?:\s*--[^\n]*\n?)+)}i';
 
         if (preg_match($pattern, $sql, $match) !== 1) {
             return null;