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<?php echo preg_replace('/(?<!£)\d+/u', '£$0', '11-£22(£10-20)');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/F9lR1
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%2F%28%3F%3C%21%C2%A3%29%5Cd%2B%2Fu'
          2        SEND_VAL                                                 '%C2%A3%240'
          3        SEND_VAL                                                 '11-%C2%A322%28%C2%A310-20%29'
          4        DO_ICALL                                         $0      
          5        ECHO                                                     $0
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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