I would use grep for this:

grep -o -m 1 'datab[A-Za-z0-9-]*role' filename  

The -o flag means only returned the part of the line that matches the pattern, not the whole line.

The -m 1 flag means return the first occurrence only.

The pattern is anything starting with datab followed by only letters, digits and hyphens,, then role, which is what I assume you want, since you don't just want a longer string with space or punctuation or something else inside.

To assign to a variable:

myvar="$(grep -o -m 1 'datab[A-Za-z0-9-]*role' filename )"

But I'm sure there's a way to do it with sed as well.