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<?php $reg = '/^([^\-]?)((?!0)[0-9]+)$/smi'; $str = '-20'; echo preg_replace($reg, '', $str);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/f3q32
function name:  (null)
number of ops:  9
compiled vars:  !0 = $reg, !1 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2F%5E%28%5B%5E%5C-%5D%3F%29%28%28%3F%210%29%5B0-9%5D%2B%29%24%2Fsmi'
    5     1        ASSIGN                                                   !1, '-20'
    7     2        INIT_FCALL                                               'preg_replace'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 ''
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $4      
          7        ECHO                                                     $4
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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