php-regexHow to use capture group in PHP regex?

Capture groups are used to group parts of a regular expression together and can be used to extract parts of a string. In PHP, capture groups are denoted by parentheses () and can be accessed using the $matches array.

Example code

$string = 'This is a string';
$pattern = '/This (is) a string/';
preg_match($pattern, $string, $matches);

Output example

Array
(
    [0] => This is a string
    [1] => is
)

Code explanation

• $string: The string to be matched against the regular expression.
• $pattern: The regular expression pattern, including capture groups denoted by parentheses ().
• preg_match(): The PHP function used to match a string against a regular expression pattern.
• $matches: The array that will contain the results of the match.

Helpful links

• PHP preg_match()
• Regular Expressions

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