filtering array of strings (ruby)

[tester]

I'm stuck with something, and conceptually I found different way do deal with it.

I'm looking for following solution.

Let say that I have array of strings, like this

aaxxxaayyy
abqqqcdwww
...

Now - I'd like to compare two sections within each string in the array, and if these sections match - output 0, if don't match - output 1. Thus array of 0's and 1's will be on output.

For above example - first string contains matching pair (lenght = 2, start1 = 0, start2 = 5):

aaxxxaayyy

How to make it?

[TheOm]

If I understood you right, it could be done like this:

Code: Select all

result_array = string_array.map do |str|
   str =~ /^(..)...\1/ ? 0 : 1
end

I suggest reading this. It's about regular expressions in ruby.

[CoreStylerz]

Best way is to join arrays removing duplicates(union) get common elements(intersect) and then check differences by removing all elements in array1 contained in array2(difference).

[tester]

I may have messed something last night, so I re-type. (It's a part of a project, that I left here somewhere around, and I'm rebuilding it into ruby due to multiple array operations).

Input array will be something like this:

f1a->f1a/a2
f1a->f5b/a3
f3c->f3c/d2
f3b->f5a/a3

Output array should be:

0
1
0
1

String to find and compare within lines is 3 elements long, first element starts at fixed position N1, second element starts at fixed position N2.

Output array feeds an external module with multiple inputs to sync.

[TheOm]

Here, this will work and you can also change your n1, n2 and len if you need to.

Code: Select all

n1=0 #position of first occurence
n2=5 #position of second occurence
len=3 #length of the string to find and compare
output_array = string_array.map do |str|
    str =~ /^.{#{n1}}(.{#{len}}).{#{n2-n1-len}}\1/ ? 0 : 1
end

[tester]

Thanks, sorry for delay in my response, busy days, will look into it tomorrow.