php-regexHow to use PHP regex to match a boolean value?

PHP regex can be used to match a boolean value by using the preg_match() function. This function takes two parameters, the first being the regular expression pattern and the second being the string to match against.

$string = 'true';
$pattern = '/^(true|false)$/';

if (preg_match($pattern, $string)) {
    echo 'Matched';
} else {
    echo 'Not matched';
}

Output example

Matched

The code above uses the preg_match() function to match a boolean value. The first parameter is the regular expression pattern /^(true|false)$/ which looks for either the string true or false at the beginning and end of the string. The second parameter is the string to match against, in this case true. If the string matches the pattern, the preg_match() function will return true and the Matched string will be printed. Otherwise, the Not matched string will be printed.

Helpful links

• PHP preg_match() Function
• Regular Expressions Tutorial

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