It doesn't match your tab cause it's already matched something earlier in the file. You want
s{\s+$}{}mg
rather than
s{\s+$}{}m.

Update: Removed incorrect statement about what was being matched. And added the following comment:

\s can match newlines, which produces something undesireable.
s{[\t ]+$}{}mg
does not suffer the same problem.

In reply to Re: \s vs \t by ikegami
in thread \s vs \t by marcelo.magallon

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