// b[aeou]y: This pattern looks for strings that match the following:
// b: The letter "b".
// [aeou]: Any single character that is either "a", "e", "o", or "u".
// y: The letter "y".
echo preg_match("/b[aeou]y/", "A smart boy") . "\n"; // returns true (1) b o y
echo preg_match("/b[aeou]y/", "I want to buy this laptop") . "\n"; // returns true (1) b u y
echo preg_match("/b[aeou]y/", "baay") . "\n"; // returns false (0)
echo preg_match("/b[aeou]y/", "baeouy") . "\n"; // returns false (0)
echo preg_match("/b[aeou]y/", "baey") . "\n"; // returns false (0)
echo preg_match("/b[aeou]y/", "This is beauty") . "\n"; // returns false (0)
echo preg_match("/b[aeou]y/", "PHP programming book by me") . "\n"; // returns false (0)
/*
run:
1
1
0
0
0
0
0
*/
