Logstash mixed log parsing - logstash

Question

I'm processing log files through Logstash that have single-line messages and multi-line messages of various patterns, I'd like to read the multi-line messages as single-line messages and the single-line messages as is.
Currently, I'm using the below Logstash config, but this is creating duplicate messages in the output. Moreover, for every new pattern of multi-line messages, I need to create a separate input with its own multi-line codec. Is there any way to combine all these patterns into a single input?
Sample Logstash Config File:
input {
#Using a single log file as input, containing multiple multi-line messages (patterns) and single line messages
file {
codec => multiline {
pattern => pattern1
....
}
}
file {
codec => multiline {
pattern => pattern2
....
}
}
file {
#Single line message processing
}
}
filter {
#Contains filters and parsing for both multi-line and single line messages
}
output {
#To json file
}
What I would like to do:
input {
file {
codec => multiline {
pattern => pattern1,pattern2,....
....
}
}
file {
#Single line messages input
#May not be needed
}
}
Also, can you process single-line messages with a multiline codec input in Logstash?