I used the new function "search" that scans file content in an open file.
I believe it will do what I want it to do.
However, the manual states that after a search the file pointer is positioned
to the end of the search string by default. Incorrect. The file pointer is
positioned to the beginning of the search string.
I used a bool-flag of true in the third parameter to have it position the
file pointer to the end of the search string.