Regex check for "last 4 digits of phone number"

Regex check for "last 4 digits of phone number"

If the day_phone regex (direct or from generic phone) has a capture group use it as the "last 4 digits".

For example, you might configure this for day_phone regex:

[2-9]\d{2}-\d{3}-(\d{4})( x\d+)?

With this patch the extension will be ignored for the last 4 digits.

Note: Does not require that the "last 4 digits" capture group actually contain 4 digits.

Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>