Question

I have a message, that counts message reply’s in subject..

the pattern is like this:

RE[22] Some subject

and when person replys to it, it should be:

RE[23] Some subject

So basically I need to get the value between “[” and “]” ( RE[**] ) and change it.. but I can’t just go by length, since it could change, for example, it could be “RE[254]”..

I tried to find solutions with regex or scan but I can’t get this working any way..
I don’t really understand how to do this in ruby.

Answer 1

Ok, i how it works, thanks to Christoph Petschnig and davidrac

In the end, what i did was this:

@string = "RE[22] Kaut kads random teksts..."
@get_re = nil

 @string.sub(/\d+/) do |x|
   @get_re = x.to_i + 1
end

with cinda did the trick, since my reply number allways would be first, but what if its first message and it dosnt have the RE[] prefix, so i needed to think this furher..

i modified davidrac example a bit and got the solution. So now it dosnt matter if the @string has the RE[] prefix:

@string = "RE[25] some random subject with more numbers 245 in it"

or not:

@string = "some random subject with more numbers 245 in it"

this code will edit or add it:

@get_re = nil

@string.sub(/(?<=RE\[)\d+(?=\])/) do |x|
    @get_re = @string["RE[#{x.to_i + 1}]"]
end

return @get_re? @get_re : "RE[1] " + @string