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<?php var_dump(preg_match("/\G(\\\\[^{]|[^{])+/", str_repeat('X', 1023).'{#test}', $matches)); var_dump(preg_match("/\G(\\\\[^{]|[^{])+/", str_repeat('X', 1024).'{#test}', $matches));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.6 - 7.0.20, 7.1.0 - 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
int(1) int(1)
Output for 7.0.0 - 7.0.5
int(1) bool(false)

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164.96 ms | 401 KiB | 230 Q