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  1. or download this
    $ perl -E '
> $_ = q{Bla class="x1" class="x2" class="x3" Blabla};
...
> say;'
Bla class="x1" class="x2" class="x3" Blabla
Bla class="x1 x2 x3" Blabla
  2. or download this
    $ perl -E '
> $_ = q{Bla class="x1" class="x2" class="x3" Blabla};
...
Bla class="x1" class="x2" class="x3" Blabla
Bla class="x1 x2 x3" Blabla
$