Re #2: As someone who more or less lives in the Linux command line. I concur with this. Once you know regexes well you can find productive time-saving uses for

Re #2: As someone who more or less lives in the Linux command line. I concur with this. Once you know regexes well you can find productive time-saving uses for them dozens of times a day. I rarely go a couple of days without using a regex, never mind a couple of times of year.