I see your problem but you will not solve it with a regex. Your best bet would be to get rid of such Unicode input in your tex-files and replace these characters by their proper tex-forms.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re^3: character encoding ambiguities when performing regexps with html entities by CountZero
in thread character encoding ambiguities when performing regexps with html entities by angelixd

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