10

假设我有两个正则表达式,

/eat (apple|pear)/
/I like/

和文字

"I like to eat apples on a rainy day, but on sunny days, I like to eat pears."

我想要的是使用 preg_match 获得以下索引:

match: 0,5 (I like)
match: 10,19 (eat apples)
match: 57,62 (I like)
match: 67,75 (eat pears)

有什么方法可以使用 preg_match_all 获取这些索引,而无需每次都遍历文本?

编辑:解决方案PREG_OFFSET_CAPTURE !

4

2 回答 2

26

您可以尝试PREG_OFFSET_CAPTURE以下标志preg_match()

$subject="I like to eat apples on a rainy day, but on sunny days, I like to eat pears.";
$pattern = '/eat (apple|pear)/';
preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE );
print_r($matches);

输出

$ php test.php
Array
(
    [0] => Array
        (
            [0] => eat apple
            [1] => 10
        )

    [1] => Array
        (
            [0] => apple
            [1] => 14
        )

)
于 2010-03-16T03:23:58.107 回答
0

请记住,如果您使用preg_match, 并且组不匹配,则不会返回数组,而是返回一个空字符串。您可以使用T-Regx并使用更清洁的 API:

$o = pattern('eat (apple|pear)')->match($text)->offsets()->all();
$o // [10, 14]

或者如果你想要一些更高级的匹配

pattern('eat (apple|pear)')
  ->match($text)
  ->iterate(function (Match $m) {
      $m->text();   // your fruit here
      $m->offset(); // your offset here
  });
于 2018-10-09T14:54:40.917 回答