regex - PHP preg_match returning the wrong indexes -

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i'm trying extract indexes of specific word string using php's preg_match. take example word hello:

$r = "/\b(hello)\b/u";

let's want in string:

$s = 'hello. how you, hello there. helloorona!';

if run preg_match preg_offset_capture parameter , passing in array called $matches,

preg_match($r, $s, $matches, preg_offset_capture);

i expect returned (i.e. ignoring last "hellooroona" phrase):

["hello", 0], ["hello", 20]

but in fact, when return echo value of $matches either through json_encode or looping on matches, value returned always: 

["hello", 0], ["hello", 0]

if run on similar string, let's 

$s = 'how you, hello there.';

the answer 

["hello", 13]

which correct. run on hello hello hello , 3 indexes, 0.

summary

so seems index counter returning first index. expected behavior? how actual indexes?

the second ["hello", 0] not second hello in string, match of sub group.

use preg_match_all give expected result:

// note: sub group not necessary $r = "/\bhello\b/u"; $s = 'hello. how you, hello there. helloorona!'; preg_match_all($r, $s, $matches, preg_offset_capture);

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