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How to remove dots from this combination in PHP
"I am tagging @username1.blah. and @username2.test. and @username3."

preg_replace('/@^|(.+)/', '', 'I am tagging @username1.blah. and @username2.test. and @username3. in my status.');

"I am tagging @username1blah and @username2test and @username3 in my status"

"I am tagging @username.blah and @username2.test and @username3 in my status."

php > $a = "I am tagging @username1.blah. and @username2.test. and @username3.";
php > echo str_replace(". ", " ", $a." ");
I am tagging @username1.blah and @username2.test and @username3

preg_replace('/.(s+|$)/', '1', $r);

preg_replace('/.( |$)/', '1', $string);

preg_replace("/(@S+).(?:s|$)/", "$1", $string);

$input = "I am tagging @username1.blah. and @username2.test. and @username3. in my status.";
echo preg_replace('/(@S+).(?=s|$)/', '$1', $input);

/@w+(.w+)?(?<dot>.)/