I mean something equivalent of "Merriam-Webster" in English that is available as a Windows application with full search compatibility or regular expressions !
Maybe you can offer some of them to me?
dict.cc supports fuzzy search. Try *iater to search words ending on "iater" or "b??t" to search words of four letters with the first a b and the last a t (like boot/boat). Search is case-insensitive and always searches German and English.
Being this too long to be posted as a comment, it's been converted into an answer. You might be interested in the questions and answers given here:
The title of this one doesn't sound like something you look for, but the answers given there might be helpful: Einsamkeit und Zweisamkeit
Here's your answer: http://www.dict.org/bin/Dict . Full regular expression support.
For example: How many words in the English language have all 5 vowels in order, exactly once?
Use this search expression:
^[^ -aeiou]*a[^ -aeiou]*e[^ -aeiou]*i[^ -aeiou]*o[^ -aeiou]*u[^ -aeiou]*$
To get 11 results (3 of them common words).