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1<?php
2/**
3 * @package: pvc
4 * @author: Doug Wilbourne (dougwilbourne@gmail.com)
5 */
6
7declare(strict_types = 1);
8
9namespace pvc\regex\xml;
10
11use pvc\regex\Regex;
12
13/**
14 * Class RegexXMLElementName
15 */
16class RegexXMLElementName extends Regex
17{
18    public function __construct()
19    {
20        $label = 'XMLElementName';
21
22        // use a look-ahead negative assertion so no characters are consumed, case-insensitive match
23        $pat_cannot_start_with_xml = '(?!(?i)xml)';
24
25        $pat_first_character_must_be_alpha = '[a-zA-Z]';
26
27        // "word" characters plus hyphen, period
28        $pat_contains_only_letters_digits_underscores_hyphens_periods_and_no_whitespace = '[\w\-\.]*';
29
30        $pattern = '';
31        $pattern .= '/^';
32        $pattern .= $pat_cannot_start_with_xml;
33        $pattern .= $pat_first_character_must_be_alpha;
34        $pattern .= $pat_contains_only_letters_digits_underscores_hyphens_periods_and_no_whitespace;
35        $pattern .= '$/';
36        $this->setPattern($pattern);
37        $this->setLabel($label);
38    }
39}