/^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$/

string(1) "("
string(1) "8" string(1) "|" string(1) "\" string(1) "7" string(1) ")"
string(1) "[" string(1) "\" string(1) " " string(1) "]" string(1) "?" string(1) ")" 
Array
(
    [listsParts] => Array
        (
            [0] => \7[\ ]?
        )

    [currentPositionChart] => 14
)
string(1) "\" string(1) "?" string(1) "\" string(1) "{" string(1) "3" string(1) "}" string(1) "\" string(1) "?" string(1) "[" string(1) "\" string(1) " " string(1) "]" string(1) "?" string(1) ")" 
Array
(
    [listsParts] => Array
        (
            [0] => \?\{3}\?[\ ]?
        )

    [currentPositionChart] => 34
)
Document

/^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$/

7\ )?{3}?\ )862416\-659