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@ 2022-01-02T10:53:39Z

<?php

$string = " text1 .id.123 .id.4576 text4 .id.56778 text 5 .id.76728";
preg_match_all('~\.id\.\K\d+~', $string, $m);

echo implode(',', $m[0]);

Output
Performance
VLD
References
Branches

preg_match_all: documentation ( source)
implode: documentation ( source)

preferences:dark modelive previewkey bindings

23.6 ms | 405 KiB | 5 Q