Funções da PCREpreg_filter
(PHP 5 >= 5.3.0)
preg_filter — Perform a regular expression search and replace
Descrição
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 matches. For details about how this function works, read the preg_replace() documentation.
Parâmetros
- pattern
-
- replacement
-
- subject
-
- limit
-
- count
-
Valor Retornado
Returns an array if the subject parameter is an array, or a string otherwise.
If matches are found, the new subject will be returned, otherwise subject will be returned unchanged or NULL if an error occurred.
Exemplos
Exemplo #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));
?>
O exemplo acima irá imprimir:
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
)
Veja Também
- preg_replace() - Perform a regular expression search and replace
- preg_replace_callback() - Executa uma busca usando expressão regular e modifica usando um callback
- preg_match() - Perform a regular expression match
- preg_split() - Divide a string por uma expressão regular
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