Two things that are still unclear to me from your description are whether you've got use utf8; for code like $_table{'Ö'} (or if that was just an example here), and whether your strings containing Unicode are properly decoded or not - please show one of your strings using Dump from Devel::Peek, and show an SSCCE that reproduces your situation.

In any case, a regex that matches non-ASCII characters (or bytes, depending on whether your string is decoded or not) is /([^\x00-\x7F])/.

Minor edits.

In reply to Re: Substitute some Unicodes with their escapes by haukex
in thread Substitute some Unicodes with their escapes by jjmoka

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