PCRE 함수 목록
As I had to work with PHP5.2.X and needed preg_filter I wrote a quick and dirty workaround.
<?php
if (!function_exists('preg_filter')) {
function preg_filter($pattern, $replace, $subject, $limit = -1 , &$count = null) {
if(!is_array($subject)) {
$noArray = 1 ;
$subject = array($subject);
}
$preg = preg_replace($pattern, $replace, $subject, $limit, &$count);
$diff = array_diff($preg, $subject);
if($noArray == 1) $diff = implode($diff) ;
return $diff ;
}
}
?>
preg_filter
(PHP 5 >= 5.3.0)
preg_filter — Perform a regular expression search and replace
설명
mixed preg_filter
( mixed $pattern
, mixed $replacement
, mixed $subject
[, int $limit = -1
[, int &$count
]] )
preg_filter() is identical to preg_replace() except it only returns the (possibly transformed) subjects where there was a match. For details about how this function works, read the preg_replace() documentation.
반환값
Returns an array if the subject parameter is an array, or a string otherwise.
If no matches are found or an error occurred, an empty array is returned when subject is an array or NULL otherwise.
예제
Example #1 Example comparing preg_filter() with preg_replace()
<?php
$subject = array('1', 'a', '2', 'b', '3', 'A', 'B', '4');
$pattern = array('/\d/', '/[a-z]/', '/[1a]/');
$replace = array('A:$0', 'B:$0', 'C:$0');
echo "preg_filter returns\n";
print_r(preg_filter($pattern, $replace, $subject));
echo "preg_replace returns\n";
print_r(preg_replace($pattern, $replace, $subject));
?>
위 예제의 출력:
preg_filter returns
Array
(
[0] => A:C:1
[1] => B:C:a
[2] => A:2
[3] => B:b
[4] => A:3
[7] => A:4
)
preg_replace returns
Array
(
[0] => A:C:1
[1] => B:C:a
[2] => A:2
[3] => B:b
[4] => A:3
[5] => A
[6] => B
[7] => A:4
)
참고
- PCRE Patterns
- preg_replace() - 정규 표현식 검색과 치환을 수행
- preg_replace_callback() - 콜백을 이용한 정규 표현식 검색과 치환을 수행
- preg_grep() - 패턴 매치한 부분의 배열을 반환
- preg_last_error() - Returns the error code of the last PCRE regex execution
add a note
User Contributed Notes
preg_filter
sajina_99 at hotmail dot de
25-Sep-2011 01:07
MrBertie
30-Dec-2010 07:35
Another way to filter an array, and simply return the matching items: preg_grep!
Eric Naeseth
17-Dec-2010 11:38
If you want to just filter an array based on a regular expression, without replacing any of the array values, try RegexIterator: http://us3.php.net/manual/en/class.regexiterator.php