if nLines > count of separators, no lines are displayed

[pward123]

At the following line, when nLines >= tokens.length, the existing contents of the file are not emitted as line events.

https://github.com/lucagrulla/node-tail/blob/6a771ef65b0dbdeba41f8b97bcf41f437d45db9b/src/tail.js#L62

For example, if I start a tail on a file with 17 existing lines, pass nLines: 50 and dropLastToken = 1, the regex ends up as: (?:[^\r\n]*[\r]{0,1}\n){-34}

Since it doesn't make sense to look for a negative number of matches, regex instead looks for -34 literally. The result is zero matches.