On Tue, Dec 27, 2011 at 7:04 AM, sachin kewale <[email protected]>wrote:
> hi all,
>
> i am getting the following warning for "numeric_slug = /^[0-9]+$/" this
> line in my model class,
> "warning: character class has `-' without escape"
>
Strange ... I copy/pasted your piece of code, and works fine here.
The '-' acts as a range (from '0' to '9').
peterv@ASUS:~/b$ rvm use 1.8.7
Using /home/peterv/.rvm/gems/ruby-1.8.7-p352
peterv@ASUS:~/b$ irb
001:0> numeric_slug = /^[0-9]+$/
=> /^[0-9]+$/
002:0> numeric_slug.match("1234")
=> #<MatchData "1234">
003:0> numeric_slug.match("1234aa")
=> nil
>
> can anyone know the what is the escape character used in regex ?
> i am using Ruby:1.8.7,gem:1.6.2,Rails:2.3.11.
>
The escape character is a backslash. So, if you really wanted to match a '-'
you could do 2 things:
* escape the '-' as '\-'
* place the '-' the last entry in the character class
peterv@ASUS:~/b$ rvm use 1.8.7 # also tested in 1.9.3
Using /home/peterv/.rvm/gems/ruby-1.8.7-p352
peterv@ASUS:~/b$ irb
001:0> numeric_and_dash = /^[\-0-9]+$/
=> /^[\-0-9]+$/
002:0> numeric_and_dash.match("01234-5678-91")
=> #<MatchData "01234-5678-91">
003:0> numeric_and_dash.match("0+4")
=> nil
004:0> numeric_and_dash = /^[0-9-]+$/
=> /^[0-9-]+$/
005:0> numeric_and_dash.match("01234-5678-91")
=> #<MatchData "01234-5678-91">
Also, i want to up grade my current version of Ruby ,Rails and gem with
> latest one ,but i don't know what are compatible and stable latest version
> for ruby and rails with
> rubygem ?
>
I currently use the combination below from up-to-date rvm. For development,
best is to set-up rvm , if you did not already have it.
Current up-to-date setting with rvm is:
rvm : version 1.10.0 # rvm get latest
ruby : 1.9.3[-p0] # rvm list known | egrep
'\[ruby\-\].*\[' | tail -1
rails : 3.1.3 (close to 3.2) # gem list -r rails | grep 'rails '
rubygems : 1.8.10 # rvm rubygems current
HTH,
Peter
--
Peter Vandenabeele
http://twitter.com/peter_v
http://rails.vandenabeele.com
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