Add preg_quote invokation to secure input data

src/TyposClientInterface.php

@@ -71,6 +71,9 @@ abstract class TyposClientInterface
         // Strip all tags from text
         $text = strip_tags($article->text);
 
+        $context = preg_quote($context);
+        $typo = preg_quote($typo);
+
         // Find all typos in text, capture an offset of each typo
         $typos = [];
         preg_match_all("#{$typo}#", $text, $typos, PREG_OFFSET_CAPTURE);
@@ -80,8 +83,6 @@ abstract class TyposClientInterface
         $contextMatch = [];
         preg_match_all("#{$context}#", $text, $contextMatch, PREG_OFFSET_CAPTURE);
         
-        error_log("Context match = " . print_r($contextMatch, true));
-
         $contextMatch = $contextMatch[0];
 
         if (!isset($contextMatch[0])) {