Compiling REx "b(?:a|e)t"
Final program:
   1: EXACT <b> (3)
   3: TRIE-EXACT[ae] (10)
      <a> 
      <e> 
  10: EXACT <t> (12)
  12: END (0)
anchored "b" at 0 (checking anchored) minlen 3 
Guessing start of match in sv for REx "b(?:a|e)t" against "bet"
Found anchored substr "b" at offset 0...
Guessed: match at offset 0
Matching REx "b(?:a|e)t" against "bet"
   0 <> <bet>                |  1:EXACT <b>(3)
   1 <b> <et>                |  3:TRIE-EXACT[ae](10)
   1 <b> <et>                |    State:    1 Accepted:    0 Charid:  2 CP:  65 After State:    3
   2 <be> <t>                |    State:    3 Accepted:    1 Charid:  2 CP:   0 After State:    0
                                  got 1 possible matches
                                  only one match left: #2 <e>
   2 <be> <t>                | 10:EXACT <t>(12)
   3 <bet> <>                | 12:END(0)
Match successful!
Freeing REx: "b(?:a|e)t"