在PHP中基于正则表达式执行子字符串操作

Question

在Python中，我可以根据这样的正则表达式进行子串操作。

rsDate = re.search(r"[0-9]{2}/[0-9]{2}/[0-9]{4}", testString)
filteredDate = rsDate.group()
filteredDate = re.sub(r"([0-9]{2})/([0-9]{2})/([0-9]{4})", r"\3\2\1", filteredDate)

PHP的等价物是什么？

Answer 1

您只需使用这些组来构建您的filteredDate：

$groups = array();
if (preg_match("([0-9]{2})/([0-9]{2})/([0-9]{4})", $testString, $groups))
    $filteredDate = sprintf('%s%s%s', $groups[3], $groups[2], $groups[1]);
else
    $filteredDate = 'N/A';

Answer 2

所以你想要替换......

$filteredDate = preg_replace("([0-9]{2})/([0-9]{2})/([0-9]{4})","$3$2$1",$testString);

Answer 3

试试这个：

$result = preg_replace('#([0-9]{2})/([0-9]{2})/([0-9]{4})#', '\3\2\1' , $data);