3 ms·

The notation s/<regex1>/<regex2> is perl for "replace every instance matching regex1 by regex2. Literal strings are regexes that match only themselves.

• bzbarsky 5y ago
  Not just perl. Also sed, which is likely where perl got it from.
  • majewsky 5y ago
    Not just sed. Also ed, which is where sed got it from.
    • bzbarsky 5y ago
      Yes, indeed. :)