# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/\G\s*+((\((?:\s*+(?2)\s*+(?(?!\)),)|\s*+[^()',\s]++\s*+(?(?!\)),)|\s*+'[^'\r\n]*+'\s*+(?(?!\)),))++\))|[^()',\s]++|'[^'\r\n]*+')\s*+(?:,|$)/\n/g;t' <<< "65.54.188.59 - - [13/Jul/2005:04:10:13 +0200] \"GET /fusel/Suchmaschinen.html HTTP/1.0\" 404 302 \"-\" \"msnbot/1.0 (+http://search.msn.com/msnbot.htm)\""
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html