Filtering an Array Using Regular Expressions in PHP
Given an array of strings:
<?php
$array = ['apple', 'banana', 'cherry', 'date', 'fig'];
?>
Filter the array, leaving only the elements starting with the letter 'b'.
Given an array of strings:
<?php
$arr = ['error404', 'success', 'warning', 'info', 'error500'];
?>
Filter the array, leaving only the strings containing the word 'error'.
Given an array of strings:
<?php
$arr = ['123', '45.6', '78', '9.0', 'text'];
?>
Filter the array, leaving only the strings representing integers.
Given an array of strings:
<?php
$arr = [
'user1@example.com',
'invalid',
'user2@test.org',
'not-email'
];
?>
Filter the array, leaving only valid email addresses.
