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<?php $str = "tea dae 15 abc 7,2 kg abc aa 1 aa"; $result = ""; if (preg_match('~(\d+(?:,\d+)?)\s*(kg)\b~', $str, $m)) { $result = $m[1] . $m[2]; } echo $result;
Output for 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 - 8.3.25, 8.4.1 - 8.4.12
7,2kg

preferences:
121.32 ms | 407 KiB | 5 Q