explainshell.com - grep -E %27%28%5EINT%7C%5EEXT%29%27 Script.txt %7C nl %7C sed -E -e %27s%2F%28%5B0-9%5D%2B%29.%2F%5C1%2C%2F%27 -e %27s%2F%28INT%7CEXT%29.%7B0%2C2%7D%2F%5C1%2C%2F%27 %3E SceneList.csv

-E %27%28%5EINT%7C%5EEXT%29%27 Script.txt %7C nl %7C sed -E -e %27s%2F%28%5B0-9%5D%2B%29.%2F%5C1%2C%2F%27 -e %27s%2F%28INT%7CEXT%29.%7B0%2C2%7D%2F%5C1%2C%2F%27 %3E SceneList.csv

print lines matching a pattern

Matcher Selection
    -E, --extended-regexp
           Interpret PATTERN as an extended regular expression (ERE, see below).  (-E is specified by POSIX.)

grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus
(-) is given as file name) for lines containing a match to the given PATTERN.  By  default,  grep  prints
the matching lines.

Matching Control
    -e PATTERN, --regexp=PATTERN
           Use PATTERN as the pattern.  This can be used to specify multiple search patterns, or to protect a
           pattern beginning with a hyphen (-).  (-e is specified by POSIX.)