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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...

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...