Delete lines from a text file that match multiple regexes on a text file

Question

Let's say I have FileA.txt which looks a bit like this:

43287134, string1, string2
1233, foo, bar
973, barfoo, foobar
7464, asdf, ghjk

And I've got FileB.txt with these regexes, separated by a line:

^973,
^1233,

I would like to apply FileB.txt regexes onto FileA.txt, and delete the lines that match so that final result would be:

43287134, string1, string2
7464, asdf, ghjk

Is there any tool available to do this? Thanks!

Answer 1

This is exactly what grep is designed for:

grep -v -f FileB.txt FileA.txt

• -f <filename> reads regexes from the file (instead of command line)
• -v reverse the match (prints non-matching lines)

Output:

43287134, string1, string2
7464, asdf, ghjk

Answer 2

This can also be done with sed:

while read -r REG_EX; do sed -i "/$REG_EX/d" FileA.txt; done<FileB.txt