Extracting data from a file

Question

I have a file results.txt which is like:

a.txt
{some data}
success!!

b.txt
{some data}
success!!

c.txt
{some data}
error!!

I want to extract data from it. I want an output like:

a.txt: success
b.txt: success
c.txt: error

The problem is that the {some data} part can be arbitrarily long.

How can this be done?

Answer 1

awk:

BEGIN {
  state=0
}

state==0 && /.txt$/ {
  filename=$0
  state=1
  next
}

state==1 && /!!$/ {
  print filename ": " gensub(/!!$/, "", $0)
  state=0
  next
}