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| 1 | <?php |
| 2 | namespace Apie\DateformatToRegex; |
| 3 | |
| 4 | use DateTime; |
| 5 | use DateTimeZone; |
| 6 | |
| 7 | final class DateFormatToRegex |
| 8 | { |
| 9 | // see https://www.php.net/manual/en/datetime.format.php |
| 10 | private const FORMATS = [ |
| 11 | 'd' => '((0[1-9])|([12][0-9])|(3[01]))', // days 01=>31 |
| 12 | 'j' => '(([1-9])|([12][0-9])|(3[01]))', // days 1=>31 |
| 13 | 'D' => '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)', // mon-sun |
| 14 | 'l' => '(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)', // monday-sunday |
| 15 | 'N' => '[1-7]', // day of the week number 1-7 |
| 16 | 'w' => '[0-6]', // day of the week number 0-6 |
| 17 | 'S' => '(st|nd|rd|th)', // day suffix |
| 18 | 'z' => '([0-9]|[1-9][0-9]|[12][0-9]{2}|3[0-5][0-9]|36[0-5])', // day of the year 0-365 |
| 19 | 'W' => '(0[1-9]|[1-4][0-9]|5[0-3])', // week number 1-53 |
| 20 | 'F' => '(January|February|March|April|May|June|July|August|September|October|November|December)', // january-december |
| 21 | 'M' => '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)', //jan-dec |
| 22 | 'm' => '((0[1-9])|(1[0-2]))', // months 01=>12 |
| 23 | 'n' => '([1-9]|1[0-2])', // months 1-12 |
| 24 | 't' => '(28|29|30|31)', //number of days in month |
| 25 | 'L' => '[01]', // is leap year |
| 26 | 'o' => '((|\-)[0-9]{4})', // year of current week |
| 27 | 'Y' => '((|\-)[0-9]{4})', // current year |
| 28 | 'y' => '[0-9]{2}', // year in 2 digits |
| 29 | 'a' => '(am|pm)', // am|pm |
| 30 | 'A' => '(AM|PM)', // AM|PM |
| 31 | 'B' => '[0-9]{3}', // swatch digit time |
| 32 | 'g' => '([1-9]|1[0-2])', // hours 1-12 |
| 33 | 'h' => '((0[1-9])|(1[0-2]))', // hours 01-12 |
| 34 | 'G' => '([0-9]|1[0-9]|2[0-3])', // hours 0-23 |
| 35 | 'H' => '(([01][0-9])|(2[0-3]))', // hours 00-23 |
| 36 | 'i' => '[0-5][0-9]', // minutes 00-59 |
| 37 | 's' => '[0-5][0-9]', // minutes 00-59 |
| 38 | 'u' => '[0-9]{6}', // microseconds |
| 39 | 'v' => '[0-9]{3}', // milliseconds |
| 40 | 'I' => '[01]', // 0-1 is DST |
| 41 | 'O' => '(\+\d{4})', // GMT difference, e.g. '+0200' |
| 42 | 'P' => '(\+\d{2}:\d{2})', // GMT difference, e.g. '+02:00' |
| 43 | 'p' => '(\+\d{2}:\d{2})|Z', // GMT difference, Z on +00:00 |
| 44 | 'Z' => '(-[1-9]|-[1-3][0-9]{4}|-4[0-2][0-9]{3}|-43[01][0-9]{2}|-43200|-?[1-9][0-9]{1,3}|[0-9]|[1-4][0-9]{4}|50[0-3][0-9]{2}|50400)', // GMT difference in seconds: -43200-50400 |
| 45 | 'U' => '((-|\+|)\d+)', // unix time stamp |
| 46 | 'T' => '(GMT|EST|MDT)(\+|-|)\d{4}' |
| 47 | ]; |
| 48 | |
| 49 | public static function formatToRegex(string $formatString, string $delimiter = '/'): string |
| 50 | { |
| 51 | $regex = self::createRegex($formatString, $delimiter); |
| 52 | |
| 53 | return $delimiter . '^' . $regex . '$' . $delimiter; |
| 54 | } |
| 55 | |
| 56 | private static function createRegex(string $formatString, string $delimiter = '/'): string |
| 57 | { |
| 58 | $nextIsLiteral = false; |
| 59 | $regex = ''; |
| 60 | foreach (str_split($formatString) as $character) { |
| 61 | if ($nextIsLiteral) { |
| 62 | $regex .= preg_quote($character, $delimiter); |
| 63 | $nextIsLiteral = false; |
| 64 | continue; |
| 65 | } |
| 66 | if ($character === '\\') { |
| 67 | $nextIsLiteral = true; |
| 68 | continue; |
| 69 | } |
| 70 | if ($character === 'c') { |
| 71 | // https://www.php.net/manual/en/class.datetime.php#111532 |
| 72 | $regex .= self::createRegex('Y-m-d\TH:i:sP'); |
| 73 | continue; |
| 74 | } |
| 75 | if ($character === 'r') { |
| 76 | $regex .= self::createRegex(DateTime::RFC2822); |
| 77 | continue; |
| 78 | } |
| 79 | if ($character === 'e') { // timezone identifiers |
| 80 | $regex .= self::createTimezoneIdentifierRegex($delimiter); |
| 81 | continue; |
| 82 | } |
| 83 | if (isset(self::FORMATS[$character])) { |
| 84 | $regex .= self::FORMATS[$character]; |
| 85 | } else { |
| 86 | $regex .= preg_quote($character, $delimiter); |
| 87 | } |
| 88 | } |
| 89 | return $regex; |
| 90 | } |
| 91 | |
| 92 | public static function createTimezoneIdentifierRegex(string $delimiter = '/'): string |
| 93 | { |
| 94 | $regexes = [ |
| 95 | '(\+\d{2}:\d{2})', |
| 96 | ]; |
| 97 | foreach (DateTimeZone::listIdentifiers() as $identifier) { |
| 98 | $regexes[] = preg_quote($identifier, $delimiter); |
| 99 | } |
| 100 | return '(' . implode('|', $regexes) . ')'; |
| 101 | } |
| 102 | } |