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<?php $str = '# (811) (1485) [2756] {29} [555] {15} # (811) (1476) {20} {15} (1485) [196] [2441] # (911) (619) {19} (1476) [2765] [2752] {21}'; echo preg_replace_callback('~ {(?!(?:19|20)})(\d+)}(?! *$)| *$~m', function($m) { static $rep = ''; $rep .= $m[0]; if ( !isset($m[1]) && [$ret, $rep] = [$rep, ''] ) return $ret; }, $str);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
# (811) (1485) [2756] [555] {15} {29} # (811) (1476) {20} (1485) [196] [2441] {15} # (911) (619) {19} (1476) [2765] [2752] {21}
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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