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  1. or download this
    $str = 'abac ~~~ afa~~&#x0007E
+;f';
$str =~ s|(?<!\s)\&\#x0007E\;\&\#x0007E\;\&\#x0007E\;(?!\s)|~~~|g;
print $str;
  2. or download this
    $str = 'abac &#x0007E;&#x0007E;&#x0007E; afa&#x0007E;&#x0007E;&#x0007E
+;f';
$str =~ s|(?<=\S)\&\#x0007E\;\&\#x0007E\;\&\#x0007E\;(?=\S)|~~~|g;
print $str;