/** * Tests the `String::extract()` regex helper method. */ public function testStringExtraction() { $result = String::extract('/string/', 'whole string'); $this->assertEqual('string', $result); $this->assertFalse(String::extract('/not/', 'whole string')); $this->assertEqual('part', String::extract('/\\w+\\s*(\\w+)/', 'second part', 1)); $this->assertNull(String::extract('/\\w+\\s*(\\w+)/', 'second part', 2)); }