minor #1025 Removed sanitizeSearchQuery() and moved its code into extractSearchTerms() (o-alquimista)

This PR was squashed before being merged into the master branch (closes #1025).

Discussion
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Removed sanitizeSearchQuery() and moved its code into extractSearchTerms()

As discussed in issue #1023.

Commits
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2dda3e0 Removed sanitizeSearchQuery() and moved its code into extractSearchTerms()

Author: javiereguiluz

src/Repository/PostRepository.php

@@ -58,8 +58,7 @@ public function findLatest(int $page = 1, Tag $tag = null): Paginator
      */
     public function findBySearchQuery(string $rawQuery, int $limit = Post::NUM_ITEMS): array
     {
-        $query = $this->sanitizeSearchQuery($rawQuery);
-        $searchTerms = $this->extractSearchTerms($query);
+        $searchTerms = $this->extractSearchTerms($rawQuery);
 
         if (0 === \count($searchTerms)) {
             return [];
@@ -82,20 +81,16 @@ public function findBySearchQuery(string $rawQuery, int $limit = Post::NUM_ITEMS
     }
 
     /**
-     * Removes all non-alphanumeric characters except whitespaces.
-     */
-    private function sanitizeSearchQuery(string $query): string
-    {
-        return trim(preg_replace('/[[:space:]]+/', ' ', $query));
-    }
-
-    /**
-     * Splits the search query into terms and removes the ones which are irrelevant.
+     * Transforms the search string into an array of search terms.
      */
     private function extractSearchTerms(string $searchQuery): array
     {
+        $searchQuery = trim(preg_replace('/[[:space:]]+/', ' ', $searchQuery));
         $terms = array_unique(explode(' ', $searchQuery));
 
+        /*
+         * Search terms with a very small length are left out.
+         */
         return array_filter($terms, function ($term) {
             return 2 <= mb_strlen($term);
         });