Logstash Multiline filter - multiline

Question

We have some files that are written out to our web servers whenever we have php errors. Each error has it's own file, but there are always multiple lines in each file. The files always start with the text "Excepton:". Is there a way to easily just say, "take the whole file as a log event?" See example below:
Exception: ABC_Exception_Domain -- Message: There is no valid performance dimension for the given nodeRootId.
Error Date and Time:
Date: September 25, 2014
Time: 10:38:15
Timestamp: 1411659495
PersonId: 3947680
ProcessId: 18055
Memory Usage: 18194784
Machine Id:...
and here is my configuration file that I am using to test output:
input {
file {
type => "stack_trace"
path => [ "/root/20[1-9][0-9]*" ]
start_position => "beginning"
}
}
filter {
multiline {
type => "stack_trace"
pattern => "^Exception.*$"
negate => true
what => "previous"
}
}
output {
stdout {
codec => rubydebug
}
}
I have also tried this to use the last line as the log delimiter:
input {
file {
type => "stack_trace"
path => [ "/root/20[1-9][0-9]*" ]
start_position => "beginning"
}
}
filter {
multiline {
type => "stack_trace"
pattern => "^#[0-9]{1,3} \{main\}.*$"
negate => true
what => "previous"
}
}
output {
stdout {
codec => rubydebug
}
}
The only way I ever get any results is if I update the files manually and add another Exception or main line.
Thanks in advance for any help, and let me know if I can provide anymore information.
Thanks,
Chris.