Update Search.php

$string = preg_replace('/[._-]+/', '', $string);

Ex :
Product's name : Saint-leon
Search : leon => 0 result

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$string = preg_replace('/[._-]+/', ' ', $string);
Ex :
Product's name : Saint-leon
Search : leon => 1 result

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I think that thus the search is more relevant

classes/Search.php

@@ -102,11 +102,11 @@ class SearchCore
 		$string = preg_replace('/['.PREG_CLASS_SEARCH_EXCLUDE.']+/u', ' ', $string);
 
 		if ($indexation)
-			$string = preg_replace('/[._-]+/', '', $string);
+			$string = preg_replace('/[._-]+/', ' ', $string);
 		else
 		{
 			$string = preg_replace('/[._]+/', '', $string);
-			$string = ltrim(preg_replace('/([^ ])-/', '$1', ' '.$string));
+			$string = ltrim(preg_replace('/([^ ])-/', '$1 ', ' '.$string));
 			$string = preg_replace('/[._]+/', '', $string);
 			$string = preg_replace('/[^\s]-+/', '', $string);
 		}