How to extract the extension from a filename in Julia?

user_7619808 0
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I am looking for a simple way to extract the extension (.txt, .py, .jl, etc) from a file in Julia. I looked through the Julia docs but didn't see anything specifically built for this.

julia
3 Answers

Use splitext from Filesystem

julia> splitext("/home/myuser/example.jl") 
("/home/myuser/example", ".jl") 

julia> splitext("/home/myuser/example") 
("/home/myuser/example", "")
user_129611000

While there is no built in Julia function to do this, what you can do is given the filename, split the string on a period "." as follows:

julia> filePath = "some/path/my_program.jl"
"some/path/my_program.jl"

julia> split(filePath, ".")[2]
"jl"
user_76198080

This is a faster alternative, if that is of any importance:

file_extension(file::String) = file[findlast(==('.'), file)+1:end]
user_17884200
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