added normal string filter

Author: aporat

src/FilterVar.php

@@ -39,6 +39,7 @@ protected function getDefaultFilters(): array
             'Escape' => Filters\EscapeHTML::class,
             'FormatDate' => Filters\FormatDate::class,
             'Lowercase' => Filters\Lowercase::class,
+            'NormalString' => Filters\NormalString::class,
             'Uppercase' => Filters\Uppercase::class,
             'Trim' => Filters\Trim::class,
             'StripTags' => Filters\StripTags::class,

src/Filters/NormalString.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Aporat\FilterVar\Filters;
+
+use Aporat\FilterVar\Contracts\Filter;
+
+class NormalString implements Filter
+{
+    /**
+     *  Normalize string with letters, digits
+     */
+    public function apply(mixed $value, array $options = []): string
+    {
+        return (string) preg_replace('/[^A-Za-z0-9 \-:_.]/u', '', strip_tags($value));
+    }
+}