julia> s = "abcdefg"
"abcdefg"
julia> n = 3
3
julia> s[n:end]
"cdefg"
julia> m=2
2
julia> s[n:n+m]
"cde"
julia> s[1:end-1]
"abcdef"
julia> s[search(s,'c')]
'c'
julia> s[search(s,'c'):search(s,'c')+m]