I found this old answer about my problem...
"FileLocator Pro doesn't support multi-line regular expressions at the moment. The expression must match each line independently of the others. The next version of FileLocator Pro should fix this.
answered May 5, 2013 by dave"
is now possible to search across multiple lines using Regular expression?
I tried it with different parameters (\n\r\s\S...and more....) but still not working...