Le masque #[./]([a-z-]+)# correspond-il à :

ftp://ftp.developpez.com/g-rossolini/ ?
Oui :

Array
(
    [0] => Array
        (
            [0] => /ftp
            [1] => ftp
        )

    [1] => Array
        (
            [0] => .developpez
            [1] => developpez
        )

    [2] => Array
        (
            [0] => .com
            [1] => com
        )

    [3] => Array
        (
            [0] => /g-rossolini
            [1] => g-rossolini
        )

)

http://g-rossolini.developpez.com/ ?
Oui :

Array
(
    [0] => Array
        (
            [0] => /g-rossolini
            [1] => g-rossolini
        )

    [1] => Array
        (
            [0] => .developpez
            [1] => developpez
        )

    [2] => Array
        (
            [0] => .com
            [1] => com
        )

)

http://www.developpez.com/ ?
Oui :

Array
(
    [0] => Array
        (
            [0] => /www
            [1] => www
        )

    [1] => Array
        (
            [0] => .developpez
            [1] => developpez
        )

    [2] => Array
        (
            [0] => .com
            [1] => com
        )

)

http://php.developpez.com/ ?
Oui :

Array
(
    [0] => Array
        (
            [0] => /php
            [1] => php
        )

    [1] => Array
        (
            [0] => .developpez
            [1] => developpez
        )

    [2] => Array
        (
            [0] => .com
            [1] => com
        )

)

Guillaume Rossolini ?
Non
0123456789 ?
Non
01 23 45 67 89 ?
Non