Something
public text v1 · immutable$ves="<p> bla bla bla";
$pr = "<p>";
if (strstr($ves,$pr) && preg_match('/^[a-zA-Z0-9_\-]+.$pr$/', $ves) == 0) $ves.=$pr;$ves="<p> bla bla bla";
$pr = "<p>";
if (strstr($ves,$pr) && preg_match('/^[a-zA-Z0-9_\-]+.$pr$/', $ves) == 0) $ves.=$pr;