Compiling REx "(?<=[.])[^.]*$"
Final program:
   1: IFMATCH[-1] (7)
   3:   EXACT <.> (5)
   5:   SUCCEED (0)
   6: TAIL (7)
   7: STAR (19)
   8:   ANYOF[\0-\-/-\377{unicode_all}] (0)
  19: EOL (20)
  20: END (0)
floating ""$ at 0..2147483647 (checking floating) minlen 0
Guessing start of match in sv for REx "(?<=[.])[^.]*$" against "xyz.foo"
Found floating substr ""$ at offset 7...
Guessed: match at offset 0
Matching REx "(?<=[.])[^.]*$" against "xyz.foo"
   0 <> <xyz.foo>            |  1:IFMATCH[-1](7)
                                  failed...
   1 <x> <yz.foo>            |  1:IFMATCH[-1](7)
   0 <> <xyz.foo>            |  3:  EXACT <.>(5)
                                    failed...
                                  failed...
   2 <xy> <z.foo>            |  1:IFMATCH[-1](7)
   1 <x> <yz.foo>            |  3:  EXACT <.>(5)
                                    failed...
                                  failed...
   3 <xyz> <.foo>            |  1:IFMATCH[-1](7)
   2 <xy> <z.foo>            |  3:  EXACT <.>(5)
                                    failed...
                                  failed...
   4 <xyz.> <foo>            |  1:IFMATCH[-1](7)
   3 <xyz> <.foo>            |  3:  EXACT <.>(5)
   4 <xyz.> <foo>            |  5:  SUCCEED(0)
                                    subpattern success...
   4 <xyz.> <foo>            |  7:STAR(19)
                                  ANYOF[\0-\-/-\377{unicode_all}] can match 3 times out of 2147483647...
   7 <xyz.foo> <>            | 19:  EOL(20)
   7 <xyz.foo> <>            | 20:  END(0)
Match successful!