PHP: How do I get the string indexes of a preg_match_all?
-
20-09-2019 - |
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 days, I like to eat pears."
What I want is to get the following indexes with preg_match:
match: 0,5 (I like)
match: 10,19 (eat apples)
match: 57,62 (I like)
match: 67,75 (eat pears)
Is there any way to get these indexes using preg_match_all without looping through the text every single time?
EDIT: SOLUTION PREG_OFFSET_CAPTURE !
Solution
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
)
)
OTHER TIPS
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
});
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