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-== \String Slices
-
-A _slice_ of a string is a substring that is selected by certain criteria.
-
-These instance methods make use of slicing:
-
-- String#[] (also aliased as String#slice) returns a slice copied from +self+.
-- String#[]= returns a copy of +self+ with a slice replaced.
-- String#slice! returns +self+ with a slice removed.
-
-Each of the above methods takes arguments that determine the slice
-to be copied or replaced.
-
-The arguments have several forms.
-For string +string+,  the forms are:
-
-- <tt>string[index]</tt>.
-- <tt>string[start, length]</tt>.
-- <tt>string[range]</tt>.
-- <tt>string[regexp, capture = 0]</tt>.
-- <tt>string[substring]</tt>.
-
-<b><tt>string[index]</tt></b>
-
-When non-negative integer argument +index+ is given,
-the slice is the 1-character substring found in +self+ at character offset +index+:
-
-  'bar'[0]       # => "b"
-  'bar'[2]       # => "r"
-  'bar'[20]      # => nil
-  'тест'[2]      # => "с"
-  'こんにちは'[4]  # => "は"
-
-When negative integer +index+ is given,
-the slice begins at the offset given by counting backward from the end of +self+:
-
-  'bar'[-3]         # => "b"
-  'bar'[-1]         # => "r"
-  'bar'[-20]        # => nil
-
-<b><tt>string[start, length]</tt></b>
-
-When non-negative integer arguments +start+ and +length+ are given,
-the slice begins at character offset +start+, if it exists,
-and continues for +length+ characters, if available:
-
-  'foo'[0, 2]       # => "fo"
-  'тест'[1, 2]      # => "ес"
-  'こんにちは'[2, 2]  # => "にち"
-  # Zero length.
-  'foo'[2, 0]       # => ""
-  # Length not entirely available.
-  'foo'[1, 200]     # => "oo"
-  # Start out of range.
-  'foo'[4, 2]      # => nil
-
-Special case: if +start+ is equal to the length of +self+,
-the slice is a new empty string:
-
-  'foo'[3, 2]   # => ""
-  'foo'[3, 200] # => ""
-
-When negative +start+ and non-negative +length+ are given,
-the slice beginning is determined by counting backward from the end of +self+,
-and the slice continues for +length+ characters, if available:
-
-  'foo'[-2, 2]    # => "oo"
-  'foo'[-2, 200]  # => "oo"
-  # Start out of range.
-  'foo'[-4, 2]     # => nil
-
-When negative +length+ is given, there is no slice:
-
-  'foo'[1, -1]  # => nil
-  'foo'[-2, -1] # => nil
-
-<b><tt>string[range]</tt></b>
-
-When Range argument +range+ is given,
-creates a substring of +string+ using the indices in +range+.
-The slice is then determined as above:
-
-  'foo'[0..1]    # => "fo"
-  'foo'[0, 2]    # => "fo"
-
-  'foo'[2...2]   # => ""
-  'foo'[2, 0]    # => ""
-
-  'foo'[1..200]  # => "oo"
-  'foo'[1, 200]  # => "oo"
-
-  'foo'[4..5]    # => nil
-  'foo'[4, 2]    # => nil
-
-  'foo'[-4..-3]  # => nil
-  'foo'[-4, 2]   # => nil
-
-  'foo'[3..4]    # => ""
-  'foo'[3, 2]    # => ""
-
-  'foo'[-2..-1]  # => "oo"
-  'foo'[-2, 2]   # => "oo"
-
-  'foo'[-2..197] # => "oo"
-  'foo'[-2, 200] # => "oo"
-
-<b><tt>string[regexp, capture = 0]</tt></b>
-
-When the \Regexp argument +regexp+ is given,
-and the +capture+ argument is <tt>0</tt>,
-the slice is the first matching substring found in +self+:
-
-  'foo'[/o/] # => "o"
-  'foo'[/x/] # => nil
-  s = 'hello there'
-  s[/[aeiou](.)\1/] # => "ell"
-  s[/[aeiou](.)\1/, 0] # => "ell"
-
-If argument +capture+ is given and not <tt>0</tt>,
-it should be either an capture group index (integer)
-or a capture group name (string or symbol);
-the slice is the specified capture (see Regexp@Capturing):
-
-  s = 'hello there'
-  s[/[aeiou](.)\1/, 1] # => "l"
-  s[/(?<vowel>[aeiou])(?<non_vowel>[^aeiou])/, "non_vowel"] # => "l"
-  s[/(?<vowel>[aeiou])(?<non_vowel>[^aeiou])/, :vowel] # => "e"
-
-If an invalid capture group index is given, there is no slice.
-If an invalid capture group name is given, +IndexError+ is raised.
-
-<b><tt>string[substring]</tt></b>
-
-When the single \String argument +substring+ is given,
-returns the substring from +self+ if found, otherwise +nil+:
-
-  'foo'['oo'] # => "oo"
-  'foo'['xx'] # => nil