Grep multiple strings from text file

Question

Okay so I have a textfile containing multiple strings, example of this -

Hello123
Halo123
Gracias
Thank you
...

I want grep to use these st

Answer 1

With GNU grep:

grep -f file1 file2

-f FILE: Obtain patterns from FILE, one per line.

Output:

123-example-Halo123
321-example-Gracias-com-no