You could either do a global substitution something like $field =~ s{\n}{ }g to replace any newline with a space or you could achieve the same thing with split and join, something like $field = join q{ }, split m{\n}, $field;. In each case you are going to have to handle a big gap in your line because of the indentation of the second line of the title. However, this post should give you enough clues about s{this}{the other} to solve that for yourself. Big hint, \s+ means one or more white-space characters.

Best of luck,

JohnGG