Extended regular expressions

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Additions to standard regular expressions

1. Special brackets [% and %]. Characters inside the brackets are supplemented with common OCR errors. For example, [%S%] may allow S, $, and 5.
2. Special words inside [%...%] for common character sets and OCR errors:
   • LETTERS — Capital Latin letters and characters commonly recognized as capital Latin letters.
   • DIGITS — Digits and characters commonly recognized as digits.
   • LETTERSANDDIGITS — Capital Latin letters, digits, and characters commonly recognized as capital Latin letters and digits.