3v4l.org

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<?php $a = "2012-05-18 usr abc removed device id=858 sn=abc cmmac=000 drumac=123"; $b = "2012-05-18 usr abc removed device id=858 sn=abc cmmac=000 drumac=12352015-03-26 usr mabdel001c removed device id=814 sn=abcd cmmac=1234 drumac=000"; Echo str_replace($a, "", $b);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
52015-03-26 usr mabdel001c removed device id=814 sn=abcd cmmac=1234 drumac=000
preferences:
100.91 ms | 1576 KiB | 4 Q