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<?php $str = "Faktura č.: XYZ"; preg_match("~^\\s*Faktura\\s+č.:\\s*(?P<invoice>\S+)(?:\\s+za\\s+období\\s+0?(?P<month>\\d{1,2})\\s*/\\s*(?P<year>\\d{4}))?\\s*$~iu", $str, $matches); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jgvc6
function name:  (null)
number of ops:  10
compiled vars:  !0 = $str, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Faktura+%C4%8D.%3A+XYZ'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%7E%5E%5Cs%2AFaktura%5Cs%2B%C4%8D.%3A%5Cs%2A%28%3FP%3Cinvoice%3E%5CS%2B%29%28%3F%3A%5Cs%2Bza%5Cs%2Bobdob%C3%AD%5Cs%2B0%3F%28%3FP%3Cmonth%3E%5Cd%7B1%2C2%7D%29%5Cs%2A%2F%5Cs%2A%28%3FP%3Cyear%3E%5Cd%7B4%7D%29%29%3F%5Cs%2A%24%7Eiu'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    6     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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