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<?php $hash = '4dff4ea340f0a823f15d3f4f01ab62eae05da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a'; //^ Indica o inicio do texto //(.{n}) Captura os próximos n caracteres. //(.+)$ Captura os caracteres restantes até o final do texto. $pattern = '/^(.{8})(.{4})(.{4})(.{4})(.+)$/'; // $n.. representa cada um dos grupos entre parenteses, onde n indica a posição do grupo no $pattern. $replacement = '$1-$2-$3-$4-$5'; $masked = preg_replace($pattern, $replacement, $hash); echo $masked; 
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6bJSU
function name:  (null)
number of ops:  11
compiled vars:  !0 = $hash, !1 = $pattern, !2 = $replacement, !3 = $masked
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '4dff4ea340f0a823f15d3f4f01ab62eae05da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a'
    7     1        ASSIGN                                                   !1, '%2F%5E%28.%7B8%7D%29%28.%7B4%7D%29%28.%7B4%7D%29%28.%7B4%7D%29%28.%2B%29%24%2F'
   10     2        ASSIGN                                                   !2, '%241-%242-%243-%244-%245'
   12     3        INIT_FCALL                                               'preg_replace'
          4        SEND_VAR                                                 !1
          5        SEND_VAR                                                 !2
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                         $7      
          8        ASSIGN                                                   !3, $7
   14     9        ECHO                                                     !3
   15    10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
153.69 ms | 1014 KiB | 14 Q