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I'm not familiar with the 'mtr' command, but I'll guess that its sending out pings and presenting a summary that includes packet loss. Your getting tripped up because you are parsing the whole log...

The system I use doesn't have lookbehinds, so I can't experiment and definitively say why your lookbehind attempts were failing. The \S is not standard in REs either. A standard ERE that matches a...

Please show us a sample input file (including samples of the lines that are giving you problems with spaces) and the output you are trying to produce.

What operating system are you using. Some...