The only universal way of removing all the junk would be something like:
$txt =~ s/.//g;
It does, however, have the unfortunate side effect of removing other data as well.
On a more serious note: What's junk for you might be important data for someone else. So it's impossible to have a universal way of removing junk unless there's a universal consensus on what constitutes junk. If you could specify what bits you consider junk, and which bits you consider useful, it would be a start.
...roboticus
When your only tool is a hammer, all problems look like your thumb.
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