PHP: How do I get the string indexes of a preg_match_all?

Question

let\'s say I have two regexp\'s,

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

and text

\"I like to eat apples on a rainy day, but on sunny          


        

Answer 1

Please keep in mind that if you use preg_match, and a group isn't matched then not an array will be returned, but an empty string. You can use T-Regx and use cleaner API:

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

Or if you want some more advanced matches

pattern('eat (apple|pear)')
  ->match($text)
  ->iterate(function (Match $m) {
      $m->text();   // your fruit here
      $m->offset(); // your offset here
  });

Answer 2

You can try PREG_OFFSET_CAPTURE flag for 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);

Output

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

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

)