Category: regular expressions

https://www.gnu.org/software/bash/manual/html_node/Conditional-Constructs.html — look for the very helpful xxx.txt example! I was tempted to put the entire pattern in (double) quotes. But that’s not Bash style. You can “certainly” put literal parts in quotes, but regexp parts do not belong in quotes — quotes are good for protecting, amongst other aspects: protecting against interpretation as regular expression. That’s…