sed: split POSIX, GNU and BSD (#9609)

pages/common/sed.md

@@ -12,14 +12,6 @@
 
 `{{command}} | sed -f {{path/to/script.sed}}`
 
-- Replace all `apple` (extended regex) occurrences with `APPLE` (extended regex) in all input lines and print the result to `stdout`:
-
-`{{command}} | sed -E 's/(apple)/\U\1/g'`
-
 - Print just a first line to `stdout`:
 
 `{{command}} | sed -n '1p'`
-
-- Replace all `apple` (basic regex) occurrences with `mango` (basic regex) in all input lines and save modifications to a specific file:
-
-`sed -i 's/apple/mango/g' {{path/to/file}}`