regex phone number part 2

[eli03]

from the link http://www.phpbuilder.com/board/showthread.php?s=&threadid=10292650 .

The phone number regular expression is working really fine, here is the code

preg_match_all("/(\(|){1}[2-9][0-9]{2}(\)|){1}([\.\- ]|)[2-9][0-9]{2}([\.\- ]|)[0-9]{4}/", $var, $match); 

it matches this format:
(Xxx) Xxx-Xxxx
(Xxx) Xxx Xxxx
Xxx Xxx Xxxx
Xxx-Xxx-Xxxx
XxxXxxXxxx
Xxx.Xxx.Xxxx

now, how do i edit the regex to parse also this format: xxx-xxxx ?

thanks

[mtmosier]

preg_match_all("/((\\(|){1}[2-9][0-9]{2}(\\)|){1})?([\\.\\- ]|)[2-9][0-9]{2}([\\.\\- ]|)[0-9]{4}/", $var, $match);

Basically put parenthesis around the section which matches the first part and put a "?" after it.

This does allow it to match numbers with invalid area codes though, since it can just exclude that part and still match. Area codes like (123).

[eli03]

opsss.. it also read this kind of format ex: 33456789, and output 3345678. or 342343432443535435435 and get 7 digits number.