EREs are usually also available as an option to sed sometimes this is expressed using sed -r, other times sed -E. The second by tools like egrep ( grep -E), awk, lex, and emacs. The first is historically implemented by utilities like grep, sed, and ed. POSIX defines two classes of regex languages: basic regular expressions (BREs) and extended regular expressions (EREs). If you don't have any length-2 filenames like. Hence, to match all of the four rightmost columns, but neither of the two leftmost ones, you need to combine three glob patterns: *. How do I construct a shell glob-pattern that matches all files except "." and "." ? (from Unix FAQ 2.11) Todo: What contexts automatically suppress glob-expansion? If set -f / set -o noglob, glob-expansion is disabled.
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