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<?php $regex = '~ (?P<function_name>.*?)\s*(?P<parameters>\(.*?\))\s*~six'; preg_match($regex, 'printr(abc,assdd)', $matches); print_r($matches);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/sa9VY
function name:  (null)
number of ops:  10
compiled vars:  !0 = $regex, !1 = $matches
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   7     0  E >   ASSIGN                                                   !0, '%7E%0A++%28%3FP%3Cfunction_name%3E.%2A%3F%29%5Cs%2A%28%3FP%3Cparameters%3E%5C%28.%2A%3F%5C%29%29%5Cs%2A%7Esix'
   9     1        INIT_FCALL                                               'preg_match'
         2        SEND_VAR                                                 !0
         3        SEND_VAL                                                 'printr%28abc%2Cassdd%29'
         4        SEND_REF                                                 !1
         5        DO_ICALL                                                 
  10     6        INIT_FCALL                                               'print_r'
         7        SEND_VAR                                                 !1
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0