preg_match函數

(PHP 4, PHP 5, PHP 7, PHP 8)

preg_match — 执行匹配正则表达式

preg_match(
string $pattern,
string $subject,
array &$matches = null,
int $flags = 0,
int $offset = 0
)
搜索subject与pattern定的正则表达式的一个匹配

<?php
$subject = "abcdef";
$pattern = '/^def/';
preg_match($pattern, substr($subject,3), $matches, PREG_OFFSET_CAPTURE);
print_r($matches);
?>

以上示例会输出：

Array
(
    [0] => Array
        (
            [0] => def
            [1] => 0
        )

)