javascript - Format numeric string -

i've following string (meaning it's not numeric):

"0870490055012000000000" 

wich 22 characters long. need transform into:

"087.049.0055.0120.0000.0000" 

using php or on js/client side.

i found this not able solve problem.

---

i guess there many ways solve this. i'm asking like:

$x= format("00000", "xxx.xxx..xxx.x.x.x") 

or

$x = preg_replace("/a;;w.;w;e;ew") 

with php, can use this:

$str = preg_replace('~\a\d{3}\k\d{3}|\d{4}~', '.$0', $str); 

where \a anchor start of string.

\k removes have been matched on left match result.

if need more general apply mask string, link shared in question give way do.