PHP Regular Expression validation to allow only upto 1-5 dots in a Email-ID/string [closed]

In PHP, how to add a regression to validate a string if it has more than 5 dots (.) in a Email-ID/string

For example: [e-mail]

If it has more than 5 or 7 dots, I need to show the validation message. Kindly help please.

Answer

I wouldn’t bother with regex on this, just split the string on your delimiter, count the items and subtract 1.

$s = '[e-mail]';
$dotCount = count(explode('.', $s)) - 1