research!rsc: Glob Matching Can Be Simple And Fast TooHere’s a straightforward benchmark. Time how long it takes to run ls (a*)nb in a directory with a single file named a100, compared to running ls | grep (a.*)nb. Superscripts denote string repetition and parentheses are for grouping only, so that when n is 3, we’re running ls a*a*a*b in a directory containing the single file aaa...aaa (100 a’s), compared against ls | grep a.*a.*a.*b in the same dir
