ruby/doc/string/rpartition.rdoc

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Returns a 3-element array of substrings of +self+.
Matches a pattern against +self+, scanning backwards from the end.
The pattern is:
- +string_or_regexp+ itself, if it is a Regexp.
- <tt>Regexp.quote(string_or_regexp)</tt>, if +string_or_regexp+ is a string.
If the pattern is matched, returns pre-match, last-match, post-match:
'hello'.rpartition('l') # => ["hel", "l", "o"]
'hello'.rpartition('ll') # => ["he", "ll", "o"]
'hello'.rpartition('h') # => ["", "h", "ello"]
'hello'.rpartition('o') # => ["hell", "o", ""]
'hello'.rpartition(/l+/) # => ["hel", "l", "o"]
'hello'.rpartition('') # => ["hello", "", ""]
'тест'.rpartition('т') # => ["тес", "т", ""]
'こんにちは'.rpartition('に') # => ["こん", "に", "ちは"]
If the pattern is not matched, returns two empty strings and a copy of +self+:
'hello'.rpartition('x') # => ["", "", "hello"]
Related: String#partition, String#split.