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vendor/workerman/validation/library/Rules/Vowel.php

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+<?php
+
+/*
+ * Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * SPDX-License-Identifier: MIT
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+use function preg_match;
+
+/**
+ * Validates whether the input contains only vowels.
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Nick Lombard <github@jigsoft.co.za>
+ */
+final class Vowel extends AbstractFilterRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function validateFilteredInput(string $input): bool
+    {
+        return preg_match('/^[aeiouAEIOU]+$/', $input) > 0;
+    }
+}