How to match one per line in a regex?

Question

I\'m having a problem with a regex I created. My company searches for errors in an error file and tries to match the file to a set of possible strings. If one of the strings

Answer 1

Yes, use

r"(?m)^.*?(is a duplicate for this vendor|Duplicate transaction detected)"

See proof. The (?m)^.*? part makes the pattern match at the start of each line since the caret matches the line start position and the .*? matches any zero or more characters other than linebreaks, but as few as possible.