def tags = new File("path/to/tags/file.txt").text.split("\n")
new File("path/to/image/folder").eachFile{ f ->
    def tag = tags[f.name.replaceAll(/\.[.]+$/)]
    if (tag ==~ /(?i).*(nsfw|sketchy).*).moveTo("nsfw/")
    else if (tag ==~ /(?i).*sfw.*/) f.moveTo("sfw/")
}