Gsub patern

rubyonrails-talk
1

Hello,

I am trying to apply a gsub! to a string. I want to know how to make the pattern evaluate that everything that IS NOT numbers, letters or commas should be replaced with ""(nil). Any ideas in how to do this pattern?

Thanks a lot,

Elías

2

irb(main):009:0> "123***,ABC,$$%abc,----+X+----".gsub(/[^\w,]/, '') => "123,ABC,abc,X"

Build a character class with Then choose \w and , as characters in the class that you want   (although note that \w includes all alphanumerics and _) Then negate them both with ^ at the start of the character class

Much more information about Regexp in Ruby can be found here:

http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_stdtypes.html#S4

-Michael

3

Hello,

I am trying to apply a gsub! to a string. I want to know how to make the pattern evaluate that everything that IS NOT numbers, letters or commas should be replaced with ""(nil). Any ideas in how to do this pattern?

/[^[:alnum:],]/

[^ ] - is a negated character class [:alnum:] - is the POSIX character class for alphanumerics , - is a comma :wink:

Thanks a lot,

Elías

Since you have an accented character in you name, I'm assuming that the [:alnum:] class is better than just a-zA-Z0-9 since it should encompass the accented characters, too.

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com

4

Hi,

You can use gsub(/[^0-9a-zA-Z,]/, ‘’) to replace only non numbers, alphabets and ,

Regards, NAYAK

5

Thanks a lot Michael, it worked perfectly.

Thanks for the link too, it cleared some things up.

Elías

6

Hi,

You can use gsub(/[^0-9a-zA-Z,]/, '') to replace only non numbers, alphabets and ,

That's not reliable if you're outside an English environment. :alnum: is a better solution.

Regards, NAYAK

Best,

7

I should mention this neat web site, too:

You can try out Ruby regular expressions right in your browser and see what they match.