How to Split a String in Ruby and Get All Items Except the First One

How to split a string in Ruby and get all items except the first one?

Try this:

first, *rest = ex.split(/, /)

Now first will be the first value, rest will be the rest of the array.

Split a string and remove the first element in string

The 'split' method works in this case

https://apidock.com/ruby/String/split

'4.0.0-4.0-M-672092'.split('-')[1..-1].join('-')

# => "4.0-M-672092"

Just be careful, in this application is fine, but in long texts this might become unoptimized, since it splits all the string and then joins the array all over again

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If you need this in wider texts to be more optimized, you can find the "-" index (which is your split) and use the next position to make a substring

text = '4.0.0-4.0-M-672092'
text[(text.index('-') + 1)..-1]

# => "4.0-M-672092"

But you can't do it in one line, and not finding a split character will result in an error, so use a rescue statement if that is possible to happen

Split string by every first space in ruby

Maybe using scan would give you your expected output easier:

p str.scan(/[A-Z]+|\s{3}/)
# ["AB", "C", "   ", "D", "E", "   ", "F"]

As your input is only capitalized characters, [A-Z] would work, /[a-z]/i is for both cases.

Wondering why such an output:

p str.scan(/[A-Z]+|\s{3}/).map(&:split)
# [["AB"], ["C"], [], ["D"], ["E"], [], ["F"]]

Select all characters in a string until a specific character Ruby

You can avoid creating an unnecessary Array (like Array#split) or using a Regex (like Array#gsub) by using.

a = "2.452811139617034,42.10874821716908|3.132087902867818,42.028314077306646|-0.07934861041448178,41.647538468746916|-0.07948265046522918,41.64754863599606"

a[0,a.index('|')]
#=>"2.452811139617034,42.1087482171"

This means select characters at positions 0 up to the index of the first pipe (|). Technically speaking it is start at position 0 and select the length of n where n is the index of the pipe character which works in this case because ruby uses 0 based indexing.

As @CarySwoveland astutely pointed out the string may not contain a pipe in which case my solution would need to change to

#to return entire string
a[0,a.index('|') || a.size]
# or
b = a.index(?|) ? a[0,b] : a
# or to return empty string
a[0,a.index('|').to_i]
# or to return nil
a[0,a.index(?|) || -1]

How to count length after split in ruby except some values inside the string?

Think in terms of receivers. You send split to a string and it returns an array. You then send length to that array:

str.split(',')
#=> ["a", "3", "b", "c", "0"]

str.split(',').length
#=> 4

So in order to exclude '0', you could create an array that doesn't contain the unwanted elements and call length on that array: (e.g. via difference)

str.split(',').difference(['0'])
#=> ["a", "3", "b", "c"]

str.split(',').difference(['0']).length
#=> 4

or you could call count and specify to only count elements that are not '0':

str.split(',').count { |x| x != "0" }
#=> 4

What is the best way to split a string to get all the substrings by Ruby?

def split_word s
  (0..s.length).inject([]){|ai,i|
    (1..s.length - i).inject(ai){|aj,j|
      aj << s[i,j]
    }
  }.uniq
end

And you can also consider using Set instead of Array for the result.

PS: Here's another idea, based on array product:

def split_word s
  indices = (0...s.length).to_a
  indices.product(indices).reject{|i,j| i > j}.map{|i,j| s[i..j]}.uniq
end

How to split string into only two parts with a given character in Ruby?

String#split takes a second argument, the limit.

str.split(' ', 2)

should do the trick.

Get string except first sentence

- i = article.content.index('.')

= article.content[0..i-1] # title
= article.content[i+1..-1] # content

Best way to split an array of strings in ruby?

You need map{...}, not map(...) for correct syntax in Ruby here:

array = ["string_apple", "string_banana", "string_orange"]

# Assign to a different array:
split_array = array.map{ |s| s.split(/_/) }

# Or modify the original array in place:
array.map!{ |s| s.split(/_/) }

# [["string", "apple"], ["string", "banana"], ["string", "orange"]]

How to split the first and the last element on a Ruby string?

Is this what you want to do?

first, *_, last = "now is the time for all".split
first #=> "now"
last  #=> "all"

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