how to Split and get data in ruby - ruby

Question

I am newbie in ruby.
Now, I have problem about text splitting by ruby programming.
My text is like
AA:0.88:320:800|BB:0.82:1040:1330|CC:0.77:1330:1700|DD:0.71:1700:2010|EE:1.00:2070:2390
So I need result to (process until end of text)
AA 0.88
BB 0.82
CC 0.77
DD 0.71
EE 1.00
How to coding it. Now I can only split by "|".
Best regard.

Answer 1

Use String#split:
s = 'AA:0.88:320:800|BB:0.82:1040:1330|CC:0.77:1330:1700|DD:0.71:1700:2010|EE:1.00:2070:2390'
s.split('|').each do |substring|
name, num, * = substring.split(':')
puts "#{name} #{num}"
end
output:
AA 0.88
BB 0.82
CC 0.77
DD 0.71
EE 1.00

Answer 2

And here, just for reference, is a regexp version:
s = 'AA:0.88:320:800|BB:0.82:1040:1330|CC:0.77:1330:1700|DD:0.71:1700:2010|EE:1.00:2070:2390'
p s.scan /(?:\||\A)([^:]+):([^:]+)/
# => [["AA", "0.88"], ["BB", "0.82"], ["CC", "0.77"], ["DD", "0.71"], ["EE", "1.00"]]
The code is shorter but much harder to read and debug. Use the other answers before this one!
Edit:
And here is the same regexp with some comments:
s.scan %r{
(?: \| | \A) # Look for start of string (\A) or '|' (\|) but do not include in capture (?:)
([^:]+) # Look for and capture one or more characters that are not ':'
: # Look for but do not capture a ':', Not captured as line is not in parenthesis.
([^:]+) # Repeat second line.
}x # x modifies the regexp to allow comments.

Answer 3

s = 'AA:0.88:320:800|BB:0.82:1040:1330|CC:0.77:1330:1700'
s.split('|').map { |item| # produces an array and remaps it
s1, s2, * = item.split(':')
puts "#{s1} #{s2}"
[s1, s2]
}
Hope it helps.

Answer 4

Using gsub and
regex:
str = "AA:0.88:320:800|BB:0.82:1040:1330|CC:0.77:1330:1700|" +
"DD:0.71:1700:2010|EE:1.00:2070:2390"
puts str.gsub(':',' ').scan(/(([A-Z])\2 \d\.\d\d)/).map(&:first)
AA 0.88
BB 0.82
CC 0.77
DD 0.71
EE 1.00
These are the steps:
s1 = str.gsub(':',' ')
# => "AA 0.88 320 800|BB 0.82 1040 1330|CC 0.77 1330 1700|
DD 0.71 1700 2010|EE 1.00 2070 2390" (broken for display)
s2 = s1.scan(/(([A-Z])\2 \d\.\d\d)/)
# => [["AA 0.88", "A"], ["BB 0.82", "B"], ["CC 0.77", "C"],
["DD 0.71", "D"], ["EE 1.00", "E"]]
s3 = s2.map(&:first)
# => ["AA 0.88", "BB 0.82", "CC 0.77", "DD 0.71", "EE 1.00"]
In the regex, /(...)/ and ([A-Z]) are the first and second capture groups, respectively. \2 equals what is captured by the second group, so `([A-Z])\2 requires that the same two capital letters appear together (e.g., 'CC').