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@ 2013-06-01T12:46:11Z

<?php

// initial position
var_dump(preg_match('#/search/(?P<mac>(?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\2){4}[[:xdigit:]]{2})#', '/search/12-12-12-12-12-12', $matches));
var_dump($matches);


// named subpattern
var_dump(preg_match('#/search/(?P<mac>(?:[[:xdigit:]]{2}(?P<sep>[-:]))(?:[[:xdigit:]]{2}\2){4}[[:xdigit:]]{2})#', '/search/12-12-12-12-12-12', $matches));
var_dump($matches);


// impossible to fix in general
var_dump(preg_match('#/(?P<id>\d+)/(?P<mac>(?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\3){4}[[:xdigit:]]{2})#', '/555/12-12-12-12-12-12', $matches));
var_dump($matches);


//fix
var_dump(preg_match('#((?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\2){4}[[:xdigit:]]{2})#', '12-12-12-12-12-12', $matches));
var_dump($matches);

// problem
//var_dump(preg_match('#(?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\2){4}[[:xdigit:]]{2}#', '12-12-12-12-12-12', $matches));
//var_dump($matches);

Output for git.master, git.master_jit, rfc.property-hooks: int(1) array(4) { [0]=> string(25) "/search/12-12-12-12-12-12" ["mac"]=> string(17) "12-12-12-12-12-12" [1]=> string(17) "12-12-12-12-12-12" [2]=> string(1) "-" } int(1) array(5) { [0]=> string(25) "/search/12-12-12-12-12-12" ["mac"]=> string(17) "12-12-12-12-12-12" [1]=> string(17) "12-12-12-12-12-12" ["sep"]=> string(1) "-" [2]=> string(1) "-" } int(1) array(6) { [0]=> string(22) "/555/12-12-12-12-12-12" ["id"]=> string(3) "555" [1]=> string(3) "555" ["mac"]=> string(17) "12-12-12-12-12-12" [2]=> string(17) "12-12-12-12-12-12" [3]=> string(1) "-" } int(1) array(3) { [0]=> string(17) "12-12-12-12-12-12" [1]=> string(17) "12-12-12-12-12-12" [2]=> string(1) "-" }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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