$mixed
=
[
0 => 'A:C:1',
1 => 'B:C:a',
2 => 'A:2',
3 => 'B:b',
4 => 'A:3',
7 => 'A:4',
]
#1
|
preg_filter
|
([0 => '/\d/', 1 => '/[a-z]/', 2 => '/[1a]/'], |