PHP - change phone number format using regular expression

Question

I am trying to figure out how to convert a phone number to a format
[phone]
in
876-123-4567
using a Regex replacement.

Answer 1

I think this should work

preg_replace('/^\+1(\d{3})(\d{3})(\d{4})$/i', '$1-$2-$3', '[phone]'); 

I assume +1 is a constant, and then use the \d shortcut to match decimals. The value in {} is the number of characters to match.

Answer 2

There is also a Regexp library on the Internet. This may be helpful.

Search for "phone":

http://www.regexlib.com/Search.aspx?k=phone&c=-1&m=-1&ps=20

Answer 3

I know this is not a regex, but it also works :-)

 $num = '[phone]'; $formatted = substr($num, 2, 3).'-'.substr($num, 5, 3).'-'.substr($num, 8); 

Answer 4

This suggests that there are two characters - the beginning to ignore.

 preg_replace("/([0-9a-zA-Z+]{2})([0-9a-zA-Z]{3})([0-9a-zA-Z]{3})([0-9a-zA-Z]{4})/", "$2-$3-$4", '[phone]');