RegEx for punctuation?

ruby-talk
1

Hey all,
I have a quick question about RegEx, which I don't use often and I don't have my reference book handy.
How do I gsub all non alpha-numeric characters to nothing,
I know it's something like this:
some_string.gsub!('something here', '')

but I can't for the life of me remember the RegEx for this.

thanks ahead of time

John Joyce

2

John Joyce wrote:

Hey all,
I have a quick question about RegEx, which I don't use often and I don't have my reference book handy.
How do I gsub all non alpha-numeric characters to nothing,
I know it's something like this:
some_string.gsub!('something here', '')

irb(main):002:0> ",.'abc123".gsub(/[^[:alnum:]]/, '')
=> "abc123"

···

--
Alex

3

Thanks a million!
I'm going to have to do more RegEx stuff to get it buried into my brain!

One more question though, I previously had this to turn spaces into underscores
some_string.gsub(' ','')

How can do this while removing all non-space characters?

John Joyce

···

On Aug 2, 2007, at 2:14 PM, Alex Young wrote:

John Joyce wrote:

Hey all,
I have a quick question about RegEx, which I don't use often and I don't have my reference book handy.
How do I gsub all non alpha-numeric characters to nothing,
I know it's something like this:
some_string.gsub!('something here', '')

irb(main):002:0> ",.'abc123".gsub(/[^[:alnum:]]/, '')
=> "abc123"

--
Alex

4

Found it. In Peter Cooper's book! (I knew I bought that ebook for a reason)
this is my final version:

     @asset.permalink = @asset.name.downcase.gsub(' ', '_').gsub(/\W/,'')

downcase everything, turn spaces into underscores, then take all non-alpha/non-numeric/non-underscore characters out.
sweet and simple.
For anyone else looking for it in the archives,
\w matches all alpha/numeric/underscore characters
\W matches everything else.

I could go a little further in the case of something like

title = 'Untitled #234'

and do this:

title = title.downcase.gsub(' ', '_').gsub('#', 'number').gsub(/\W/, '')

resulting in:
untitled_number234

Nice and tidy. Could be a bit further refined to make sure a space is prepended to 'number' if no space precedes '#' and to make sure a number actually follows '#' in before going to all the trouble.
If I wanted hard to read, I could even try to squeeze it all into one big RegEx, but the thing I've got above will suffice for now.

cheers,
John Joyce

···

On Aug 2, 2007, at 2:26 PM, John Joyce wrote:

On Aug 2, 2007, at 2:14 PM, Alex Young wrote:

John Joyce wrote:

Hey all,
I have a quick question about RegEx, which I don't use often and I don't have my reference book handy.
How do I gsub all non alpha-numeric characters to nothing,
I know it's something like this:
some_string.gsub!('something here', '')

irb(main):002:0> ",.'abc123".gsub(/[^[:alnum:]]/, '')
=> "abc123"

--
Alex

Thanks a million!
I'm going to have to do more RegEx stuff to get it buried into my brain!

One more question though, I previously had this to turn spaces into underscores
some_string.gsub(' ','')

How can do this while removing all non-space characters?

John Joyce