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<?php $text = ".a {\r\n // rules\r\n}\r\n\r\n.a-b,\r\n.a-b .b, .a-b.s\r\n.x .y, .x {\r\n // rules\r\n}\r\n\r\n@a {\r\n // rules\r\n}\r\n\r\n@k {\r\n // rules\r\n}"; echo preg_replace('~(?:\G(?!\A)|^[@.])[^{]*?\K\s+~m', ' ', $text);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/G80qv
function name:  (null)
number of ops:  5
compiled vars:  !0 = $text
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '.a+%7B%0D%0A++++%2F%2F+rules%0D%0A%7D%0D%0A%0D%0A.a-b%2C%0D%0A.a-b+.b%2C+.a-b.s%0D%0A.x+.y%2C+.x+%7B%0D%0A++++%2F%2F+rules%0D%0A%7D%0D%0A%0D%0A%40a+%7B%0D%0A++++%2F%2F+rules%0D%0A%7D%0D%0A%0D%0A%40k+%7B%0D%0A++++%2F%2F+rules%0D%0A%7D'
    4     1        FRAMELESS_ICALL_3                preg_replace        ~2      '%7E%28%3F%3A%5CG%28%3F%21%5CA%29%7C%5E%5B%40.%5D%29%5B%5E%7B%5D%2A%3F%5CK%5Cs%2B%7Em', '+'
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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