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<?php $str = 'thisip4:isatextexample&ineed.thistext&TXT:&andthis.idontneed&txt:&test.thistext&'; if (preg_match_all('~&([^&]*?thistext[^&]*)&~', $str, $m)) { print_r($m[1]); }
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
Array ( [0] => ineed.thistext [1] => test.thistext )
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174.51 ms | 407 KiB | 5 Q