size 21 first at 2
   1: BOL(2)
   2: OPEN1(4)
   4:   MINMOD(5)
   5:   STAR(8)
   6:     ANYOFUTF8[^?...003f   003f](0)
   8: CLOSE1(10)
  10: EXACT </>(12)
  12: OPEN2(14)
  14:   MINMOD(15)
  15:   STAR(18)
  16:     ANYOFUTF8[^/?...002f  002f 003f       003f](0)
  18: CLOSE2(20)
  20: EOL(21)
  21: END(0)
floating `/' at 0..2147483647 (checking floating) anchored(BOL) minlen 1
Guessing start of match, REx `^((?x-ism: [^\?]*? ))/((?x-ism: [^/\?]*? ))$' against `pf1ad1%/pf2%2Fad2/pdad3/pfad4/filename'..Found floating substr `/' at offset 7...
Guessed: match at offset 0
Matching REx `^((?x-ism: [^\?]*? ))/((?x-ism: [^/\?]*? ))$' against `pf1ad1%/pf2%2Fad2/pdad3/pfad4/filename'
  Setting an EVAL scope, savestack=9
   0 <> <pf1ad1%/pf2%>    |  1:  BOL
   0 <> <pf1ad1%/pf2%>    |  2:  OPEN1
   0 <> <pf1ad1%/pf2%>    |  4:  MINMOD
   0 <> <pf1ad1%/pf2%>    |  5:  STAR
  Setting an EVAL scope, savestack=9
   0 <> <pf1ad1%/pf2%>    |  8:    CLOSE1
   0 <> <pf1ad1%/pf2%>    | 10:    EXACT </>
                              failed...
                           ANYOFUTF8[^?...003f  003f] can match 38 times out of 1...
  38 <ad4/filename> <>    |  8:    CLOSE1
  38 <ad4/filename> <>    | 10:    EXACT </>
                              failed...
                           ANYOFUTF8[^?...003f  003f] can match 0 times out of 1...
                            failed...