reg.php

<?php

ini_set('display_errors', 1);
error_reporting(E_ALL);

/**
 * Created by PhpStorm.
 * User: Aleksey Kolyadin
 * Date: 22.04.2015
 * Time: 13:32
 */
class DateValidator {

	private $cyrillicDate = null;
	private $isMonthPresented = false;
	private $output = [];

	const REGEX_YEAR = '(?<year>\d{1,2})\s*(год|года|лет)';
	const REGEX_YEAR_WITH_MONTH = "(?<year>\d{1,2})\s*(год|года|лет)\s*(?<month>0?[1-9]|1[012])\s*месяц(а|ев)?";


	/**
	 * @param string $cyrillicDate
	 */
	public function __construct($cyrillicDate) {
		$this->cyrillicDate = $cyrillicDate;
		$this->checkMe();
		$this->parseMe();
	}

	private function checkMe() {
		$yearWithMonth = preg_split('@\s*(\d+)@', $this->cyrillicDate, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

		if (!count($yearWithMonth)) {
			throw new \RuntimeException('Wrong birthday');
		}

		array_filter($yearWithMonth, function ($var) {
			if (trim($var) == '') {
				throw new \RuntimeException('Wrong birthday');
			}
		});

		$this->isMonthPresented = (count($yearWithMonth) == 4) ? true : false;

		if ($this->isMonthPresented) {
			if (!preg_match('@' . self::REGEX_YEAR_WITH_MONTH . '@is', $this->cyrillicDate)) {
				throw new \RuntimeException('Wrong birthday');
			}
		}

	}

	private function parseMe() {

		if ($this->isMonthPresented) {
			$regex = self::REGEX_YEAR_WITH_MONTH;
		} else {
			$regex = self::REGEX_YEAR;
		}

		preg_match("@$regex@is", $this->cyrillicDate, $matches);

		if (!(isset($matches['month']))) {
			$matches['month'] = 0;
		}

		$this->output = [
			'year'  => $matches['year'],
			'month' => $matches['month']
		];
	}

	/**
	 * @return array
	 */
	public function getYearAndMonth() {
		return $this->output;
	}

}

$validMe = new DateValidator('5 лет 13 месяцев');

print '<pre>' . print_r($validMe->getYearAndMonth(), true) . '</pre>';