add alpha_spaces rule

Author: DenislavParvanov

README.md

@@ -667,6 +667,12 @@ The field under this rule may have alpha-numeric characters, as well as dashes a
 
 </details>
 
+<details><summary><strong>alpha_spaces</strong></summary>
+
+The field under this rule may have alpha characters, as well as spaces.
+
+</details>
+
 <details><summary><strong>in</strong>:value_1,value_2,...</summary>
 
 The field under this rule must be included in the given list of values.

src/Rules/AlphaSpaces.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Rule;
+
+class AlphaSpaces extends Rule
+{
+
+    /** @var string */
+    protected $message = "The :attribute may only allows alphabet and spaces";
+
+    /**
+     * Check the $value is valid
+     *
+     * @param mixed $value
+     * @return bool
+     */
+    public function check($value): bool
+    {
+        if (! is_string($value) && ! is_numeric($value)) {
+            return false;
+        }
+
+        return preg_match('/^[\pL\pM\s]+$/u', $value) > 0;
+    }
+}

tests/Rules/AlphaSpacesTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Rakit\Validation\Tests;
+
+use Rakit\Validation\Rules\AlphaSpaces;
+use PHPUnit\Framework\TestCase;
+
+class AlphaSpacesTest extends TestCase
+{
+
+    public function setUp()
+    {
+        $this->rule = new AlphaSpaces;
+    }
+
+    public function testValids()
+    {
+        $this->assertTrue($this->rule->check('abc'));
+        $this->assertTrue($this->rule->check('foo bar'));
+        $this->assertTrue($this->rule->check('foo bar  bar'));
+    }
+
+    public function testInvalids()
+    {
+        $this->assertFalse($this->rule->check('123'));
+        $this->assertFalse($this->rule->check('123abc'));
+        $this->assertFalse($this->rule->check('abc123'));
+        $this->assertFalse($this->rule->check('foo_123'));
+        $this->assertFalse($this->rule->check('213-foo'));
+    }
+}