How can you efficiently check if a string matches a specific pattern in PHP?

To efficiently check if a string matches a specific pattern in PHP, you can use the `preg_match()` function which performs a regular expression match. This function returns 1 if the pattern is found in the string, and 0 if it is not found. You can define your pattern using regular expressions to match specific criteria such as alphanumeric characters, email addresses, phone numbers, etc. 

$string = "Hello123";
$pattern = '/^[a-zA-Z0-9]+$/'; // Pattern to match alphanumeric characters
if (preg_match($pattern, $string)) {
    echo "String matches the pattern.";
} else {
    echo "String does not match the pattern.";
}

Keywords

Regular expressions preg_match pattern matching string validation PHP programming.

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