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-= Character Selectors
-
-== Character Selector
-
-A _character_ _selector_ is a string argument accepted by certain Ruby methods.
-Each of these instance methods accepts one or more character selectors:
-
-- String#tr(selector, replacements): returns a new string.
-- String#tr!(selector, replacements): returns +self+ or +nil+.
-- String#tr_s(selector, replacements): returns a new string.
-- String#tr_s!(selector, replacements): returns +self+ or +nil+.
-- String#count(*selectors): returns the count of the specified characters.
-- String#delete(*selectors): returns a new string.
-- String#delete!(*selectors): returns +self+ or +nil+.
-- String#squeeze(*selectors): returns a new string.
-- String#squeeze!(*selectors): returns +self+ or +nil+.
-
-A character selector identifies zero or more characters in +self+
-that are to be operands for the method.
-
-In this section, we illustrate using method String#delete(selector),
-which deletes the selected characters.
-
-In the simplest case, the characters selected are exactly those
-contained in the selector itself:
-
-  'abracadabra'.delete('a')   # => "brcdbr"
-  'abracadabra'.delete('ab')  # => "rcdr"
-  'abracadabra'.delete('abc') # => "rdr"
-  '0123456789'.delete('258')  # => "0134679"
-  '!@#$%&*()_+'.delete('+&#') # => "!@$%*()_"
-  'тест'.delete('т')          # => "ес"
-  'こんにちは'.delete('に')     # => "こんちは"
-
-Note that order and repetitions do not matter:
-
-  'abracadabra'.delete('dcab') # => "rr"
-  'abracadabra'.delete('aaaa') # => "brcdbr"
-
-In a character selector, these three characters get special treatment:
-
-- A leading caret (<tt>'^'</tt>) functions as a "not" operator
-  for the characters to its right:
-
-    'abracadabra'.delete('^bc') # => "bcb"
-    '0123456789'.delete('^852') # => "258"
-
-- A hyphen (<tt>'-'</tt>) between two other characters
-  defines a range of characters instead of a plain string of characters:
-
-    'abracadabra'.delete('a-d') # => "rr"
-    '0123456789'.delete('4-7')  # => "012389"
-    '!@#$%&*()_+'.delete(' -/') # => "@^_"
-
-    # May contain more than one range.
-    'abracadabra'.delete('a-cq-t') # => "d"
-
-    # Ranges may be mixed with plain characters.
-    '0123456789'.delete('67-950-23') # => "4"
-
-    # Ranges may be mixed with negations.
-    'abracadabra'.delete('^a-c') # => "abacaaba"
-
-- A backslash (<tt>'\'</tt>) acts as an escape for a caret, a hyphen,
-  or another backslash:
-
-    'abracadabra^'.delete('\^bc')   # => "araadara"
-    'abracadabra-'.delete('a\-d')   # => "brcbr"
-    "hello\r\nworld".delete("\r")   # => "hello\nworld"
-    "hello\r\nworld".delete("\\r")  # => "hello\r\nwold"
-    "hello\r\nworld".delete("\\\r") # => "hello\nworld"
-
-== Multiple Character Selectors
-
-These instance methods accept multiple character selectors:
-
-- String#count(*selectors): returns the count of the specified characters.
-- String#delete(*selectors): returns a new string.
-- String#delete!(*selectors): returns +self+ or +nil+.
-- String#squeeze(*selectors): returns a new string.
-- String#squeeze!(*selectors): returns +self+ or +nil+.
-
-In effect, the given selectors are formed into a single selector
-consisting of only those characters common to _all_ of the given selectors.
-
-All forms of selectors may be used, including negations, ranges, and escapes.
-
-Each of these pairs of method calls is equivalent:
-
-  s.delete('abcde', 'dcbfg')
-  s.delete('bcd')
-
-  s.delete('^abc', '^def')
-  s.delete('^abcdef')
-
-  s.delete('a-e', 'c-g')
-  s.delete('cde')