Parsing a string named ruby

Question

I have a path string similar to:

/some/long/path/filename.extension 

and I need to parse the part of "filename" in ruby

Answer 1

Use the suffix parameter of the File.basename method:

 # irb irb(main):001:0> File.basename('/some/long/path/filename.extension', '.*') => "filename" irb(main):002:0> File.basename('/some/long/path/filename.v1.extension', '.*') => "filename.v1" 

Link: http://www.ruby-doc.org/core/classes/File.html#M000026

Answer 2

There is also a Pathname class:

 require 'pathname' Pathname.new("/a/b/c/d.txt").basename.to_s => "d.txt" 

Answer 3

• if you are looking for a regex solution (like in tags), here it is:

   irb> "/some/long/path/filename.ext1.ext2".gsub(%r{.*/|\..*$},'') => "filename" 

• or a more efficient solution without regular expression:

   irb> path = "/some/long/path/filename.ext1.ext2" => "/some/long/path/filename.extension" irb> filename = path[path.rindex('/')+1..-1] => "filename.ext1.ext2" 

  and crop extension (s):

  • if you want to trim the last one:

     irb> filename[0,filename.rindex('.')] => "filename.ext1" 

  • if you want to remove all extensions (the same behavior as resolving regular expressions):

     irb> filename[0,filename.index('.')] => "filename"