Question

I'm trying to remove the extension from a string with the following structure:

name.stl

I found that I can use the basename method to get the string. The problem is that I am not using the file path, and I already have the string with the name. I just need to delete the extension from the string.

It seems to me that a regular expression would be a great option to detect the dot and delete everything from it to the end.

How can I use a regex to do this on Ruby on Rails 4?

Answer 1

There are several ways, here are 2, with rpartition and a regex:

s = "more.name.stl"
puts s.sub(/\.[^.]+\z/, '')  # => more.name
puts s.rpartition('.').first # => more.name

See the IDEONE demo

The rpartition way is clear, and as for the regex, it matches:

\. - a dot
[^.]+ - one or more characters other than a dot
\z - end of string.

Answer 2

只需使用内置方法即可。这些将在不同的操作系统中正常工作：

filename = '/path/to/foo.bar'
File.basename(filename) # => "foo.bar"
File.extname(filename) # => ".bar"
File.basename(filename, File.extname(filename)) # => "foo"

并且，如果您需要包含目录：

File.dirname(filename) # => "/path/to"

如果你不在乎，那么一个简单的split('.')就可以了：

'foo.bar'.split('.').first # => "foo"

或

'foo.bar'[/^[^.]+/] # => "foo"

Answer 3

File.basename 'name.stl', '.stl'

How can I remove a filename extension from a string in Rails 4?

3 个答案: