search function is not continued in Julia v1.0, you could use occursin I guess.
It looks like SFML is not actively maintained(last commit is one year ago). It would be great if we could upgrade the build system to BB2 with which installation related issues would be solved spontaneously. To this end, we need to build those missing BB projects from this list: Frequently Asked Questions (SFML / Learn)
I don’t know whether those wrappers were written by hand or generated using old Clang.jl, but maybe we can regenerate those bindings of the latest CSFML using Clang.jl-v0.8.