As you can see the output substitutes the string but then adds the :: and everything after it again.
No, it doesn't. You asked it to replace the sbo part, and only the sbo part, and that's what s/// did. If you want to replace the entire string, do something like: 
$_ = "$newstring\n" if /^$group/;

[download]
instead.

In reply to Re: How do I escape a :: in s///? by JavaFan
in thread How do I escape a :: in s///? by xjlittle

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