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run code in 150+ php & hhvm versions
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<?php $subject = "#CAPTION"; $pattern = '/^#([A-Z]+)/'; echo preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1Array ( [0] => Array ( [0] => #CAPTION [1] => 0 ) [1] => Array ( [0] => CAPTION [1] => 1 ) )