* is a metacharacter. Try escaping it in your regexps:
if (/START context/ .. /\* End Context \*/) {
    print unless /START context|\* End Context \*/;
}

[download]
Also, note that your data says "Exit" but your code looks for "End".

In reply to Re: I still can't get only the necessary lines from the file. by gaal
in thread I still can't get only the necessary lines from the file. by sashac88

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