php-regexHow to match a question mark in PHP regex?

To match a question mark in PHP regex, use the \? character. This will match a literal question mark, as opposed to a wildcard character.

Example code

$string = 'This is a string with a question mark?';
$pattern = '/\?/';

if (preg_match($pattern, $string)) {
    echo 'Match found!';
}

Output example

Match found!

Code explanation

• $string: This is the string that we are searching for a match in.
• $pattern: This is the regular expression pattern that we are using to search for a match.
• preg_match(): This is the PHP function that we are using to search for a match. It takes two parameters: the regular expression pattern and the string to search in.

Helpful links

• PHP preg_match() Function
• Regular Expressions Tutorial

Edit this code on GitHub