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I want to get the index as well as the results of a scan
"abab".scan(/a/)
I would like to have not only
=> ["a", "a"]
but also the index of those matches
[1, 3]
any suggestion?
976
The string. index() method is used to get the index of any character in a string in Ruby. This method returns the first integer of the first occurrence of the given character or substring.
A substring is a smaller part of a string, it's useful if you only want that specific part, like the beginning, middle, or end. How do you get a substring in Ruby? One way is to use a starting index & a number of characters, inside square brackets, separated by commas.
index is a String class method in Ruby which is used to returns the index of the first occurrence of the given substring or pattern (regexp) in the given string. It specifies the position in the string to begin the search if the second parameter is present. It will return nil if not found. Syntax: str.index()
=~ is Ruby's pattern-matching operator. It matches a regular expression on the left to a string on the right. If a match is found, the index of first match in string is returned. If the string cannot be found, nil will be returned.
Try this:
res = []
"abab".scan(/a/) do |c|
res << [c, $~.offset(0)[0]]
end
res.inspect # => [["a", 0], ["a", 2]]
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