Q. Which of the following regular expression matches any string containing 0 or 1 P?
✅ Correct Answer: (D)
P?
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<?php
$username = "Alex";
if (preg_match("([^a-z])",$username))
echo "Username must be all lowercase!";
else
echo "Username is all lowercase!";
?>
<?php
$names = array("alex", "jean", "emily", "jane");
$name = preg_grep("/^e/", $names);
print_r($name);
?>
<?php
$mail = "admin@example.com";
$mail = str_replace("a","@",$mail);
echo "Contact me at $mail.";
?>