Regex issues and up gradation Ruby ,Rails and gem

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

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’).

[email protected]:~/b$ rvm use 1.8.7
Using /home/peterv/.rvm/gems/ruby-1.8.7-p352
[email protected]:~/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

[email protected]:~/b$ rvm use 1.8.7 # also tested in 1.9.3
Using /home/peterv/.rvm/gems/ruby-1.8.7-p352
[email protected]:~/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 V.
http://twitter.com/peter_v
http://rails.vandenabeele.com

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