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<?php $expr = '#<meta\s+name\s*=\s*([\'"])http_equiv\1\s.*?content\s*=\s*([\'"])text/html\s*;\s*charset\s*=\s*([^,>\2]+)#i'; $subject = <<<HTML <HTML> <!-- $Revision: 317718 $ --> <HEAD> <TITLE>PHP Manual</TITLE> <META NAME="HTTP_EQUIV" CONTENT="text/html; charset=UTF-8"> <LINK REL="STYLESHEET" HREF="style.css"> </HEAD> HTML; preg_match($expr, $subject, $matches); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FPsem
function name:  (null)
number of ops:  14
compiled vars:  !0 = $expr, !1 = $subject, !2 = $Revision, !3 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%23%3Cmeta%5Cs%2Bname%5Cs%2A%3D%5Cs%2A%28%5B%27%22%5D%29http_equiv%5C1%5Cs.%2A%3Fcontent%5Cs%2A%3D%5Cs%2A%28%5B%27%22%5D%29text%2Fhtml%5Cs%2A%3B%5Cs%2Acharset%5Cs%2A%3D%5Cs%2A%28%5B%5E%2C%3E%5C2%5D%2B%29%23i'
    5     1        ROPE_INIT                                     3  ~6      '%3CHTML%3E%0A%3C%21--+'
    6     2        ROPE_ADD                                      1  ~6      ~6, !2
          3        ROPE_END                                      2  ~5      ~6, '%3A+317718+%24+--%3E%0A%3CHEAD%3E%0A++%3CTITLE%3EPHP+Manual%3C%2FTITLE%3E%0A++%3CMETA+NAME%3D%22HTTP_EQUIV%22+CONTENT%3D%22text%2Fhtml%3B+charset%3DUTF-8%22%3E%0A++%3CLINK+REL%3D%22STYLESHEET%22+HREF%3D%22style.css%22%3E%0A%3C%2FHEAD%3E'
    4     4        ASSIGN                                                   !1, ~5
   14     5        INIT_FCALL                                               'preg_match'
          6        SEND_VAR                                                 !0
          7        SEND_VAR                                                 !1
          8        SEND_REF                                                 !3
          9        DO_ICALL                                                 
   15    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !3
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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