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run code in 150+ php & hhvm versions
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<?php $source = 'Test [1]'; $existing = 'Test'; $pattern = sprintf('/%s \[\d+\]/', preg_quote($source, '/')); var_dump(preg_match($pattern, $existing));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0)