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  1. or download this
    $somethingelse="AA";
$var = 'BB';
$_ = 'beforeBBafter';
s@$var@$somethingelse@;
print; #prints "beforeAAafter"
  2. or download this
    $somethingelse="AA";
$var = '<a href="somefilename(x)withanumberedhash.htm#666">';
$_ = 'before<a href="somefilename(x)withanumberedhash.htm#666">after';
s@$var@$somethingelse@;
print;
  3. or download this
    $somethingelse="AA";
$var = '<a href="somefilename\(x\)withanumberedhash.htm#666">';
$_ = 'before<a href="somefilename(x)withanumberedhash.htm#666">after';
s@$var@$somethingelse@;
print;