php-regexHow to get last matched occurrence in PHP regex?
The preg_match_all
function in PHP can be used to get the last matched occurrence in a regular expression. This function takes three parameters: the pattern, the subject string, and an array to store the matches. The fourth parameter can be used to specify the flags, such as PREG_OFFSET_CAPTURE
which will capture the offset of the last matched occurrence.
$subject = 'This is a test string';
$pattern = '/\w+/';
preg_match_all($pattern, $subject, $matches, PREG_OFFSET_CAPTURE);
echo $matches[0][count($matches[0])-1][0]; // Output: string
The code above will capture all the matches of the pattern /\w+/
in the subject string This is a test string
. The PREG_OFFSET_CAPTURE
flag will capture the offset of each match. The last matched occurrence can then be accessed by using the count($matches[0])-1
index of the $matches
array.
$subject
: The subject string to be matched against the pattern.$pattern
: The regular expression pattern.$matches
: An array to store the matches.PREG_OFFSET_CAPTURE
: A flag to capture the offset of each match.count($matches[0])-1
: The index of the last matched occurrence.
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