That won't work, because the /e modifier only applies to the second part of the substitution (i.e. the 'substitute with...' part). The first part of the regex follows normal string-interpolation rules, and "&sub" is NOT interpolated in a string any more than "sub" is. This regexp looks for the literal text '&TXT_EXTENSION', and substitutes it with '.mif'.
See Zazo's reply for a correct answer.
-- 3dan
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