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<?php $subject = "text text text text [hello] text (hello2) (hello3) text"; $pattern = '/^\[([^)]*)\]/'; preg_match($pattern, $subject, $matches); print_r($matches);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/HDJdt
function name:  (null)
number of ops:  11
compiled vars:  !0 = $subject, !1 = $pattern, !2 = $matches
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'text+text+text+text+%5Bhello%5D+text+%28hello2%29+%28hello3%29+text'
   4     1        ASSIGN                                                   !1, '%2F%5E%5C%5B%28%5B%5E%29%5D%2A%29%5C%5D%2F'
   5     2        INIT_FCALL                                               'preg_match'
         3        SEND_VAR                                                 !1
         4        SEND_VAR                                                 !0
         5        SEND_REF                                                 !2
         6        DO_ICALL                                                 
   6     7        INIT_FCALL                                               'print_r'
         8        SEND_VAR                                                 !2
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0