My solution is correctly answers the particular requirement the OP stated: convert the character class 'ABCD' to a form that uses alternation. If one extrapolates that requirement to all alphanumerics, them my type of solution still works.
If one exptrapolates to metacharacters like those in 1. and 2., or to predefined POSIX classes or Unicode characters, as in 3., then obviously the parser and translator must be extended to handle these situations.
But for the simple requirements stated by the OP, a simple solution is best.
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