Select everything expect a word with spaces using regex without multiline

Question

I try to filter a text with a regex. The program I use can only replace text with a regex pattern. So I have to generate a regex that will select everything except a specific pattern/word with spaces and I will replace it with nothing (empty). Unfortunately, the program only uses regex without the multiline option

Goal:

• filter a text to get specific words

My limitations:

• only regex with replace available
• no multiline

Example Text:

ABC 11
ABC 1/10
ABC 1/20
ABC 1/20
ABC 2/10
ABC 2/20
ABC 2/30
ABC 2/40

FULLTEXT
Other Full Text

I want to select everything expect:

ABC 11
ABC 2/10
ABC 2/20
ABC 2/30
ABC 2/40

The pattern with multiline looks like this:

/^((?!ABC 11|ABC 2\/[0-9][0-9]).)*$/gm

https://regex101.com/r/l2zvMX/1

But I search for one without the "/gm". Only "/g"

Best regards, ElGammler