regex issues and up gradation Ruby ,Rails and gem

[sachin kewale]

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"
 
  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.
  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 ?
  can anyone have any suggestion on this for up gradation of the environment ?

 thanks in advanced.

--
Regards
Sachin S. Kewale

[Peter Vandenabeele]

On Tue, Dec 27, 2011 at 7:04 AM, sachin kewale <sachin...@gmail.com> 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