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<?php $string = 'PT3M'; $pattern = '/P/T?[0-9]+[SMWYD]'; $replacement = '#'; echo preg_replace($pattern, $replacement, $string);
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_replace(): Unknown modifier 'T' in /in/MI78A on line 6
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'T' in /in/MI78A on line 6

preferences:
280.09 ms | 401 KiB | 366 Q