String processing in Ruby%q,%q,%W,%W,%x,%r,%s usage

%Q

This was an alternative for double-quoted strings and when you had more quote characters in a string. Instead of putting backslashes in front of them, you can easily write:
>> %Q(Joe said: "Frank said: "#{what_frank_said}"")
=> "Joe said: "Frank said: "Hello!"""


The parenthesis " ( ..." can be replaced with any other ) non-alphanumeric characters and non-printing characters (pair s), so the following commands is equivalent:
>> %Q!Joe said: "Frank said: "#{what_frank_said}""!
>> %Q[Joe said: "Frank said: "#{what_frank_said}""]
>> %Q+Joe said: "Frank said: "#{what_frank_said}""+

can use also:
>> %/Joe said: "Frank said: "#{what_frank_said}""/
=> "Joe said: "Frank said: "Hello!"""

%q

Used for single-quoted strings. The syntax was similar to%Q, but single-quoted strings was not subject to expression substitution or escape sequences.
>> %q(Joe said: ‘Frank said: ‘#{what_frank_said} ‘ ‘)
=> "Joe said: ‘Frank said: ‘\#{what_frank_said} ‘ ‘"


Slicing a string, splitting an existing string into multiple arrays

%W

Used for double-quoted array elements. The syntax is similar to%Q
>> %W(#{foo} Bar Bar\ with\ space)
=> ["Foo", "Bar", "Bar with space"]


%w

Used for single-quoted array elements. The syntax was similar to%Q, but single-quoted elements was not subject to expression substitution or escape sequences.
>> %w(#{foo} Bar Bar\ with\ space)
=> ["\#{foo}", "Bar", "Bar with space"]


%x

Uses the method and returns the standard output of running, the ` command in a subshell. The syntax is similar to%Q.
>> %x(echo foo:#{foo})
=> "foo:Foo\n"


%r

Used for regular expressions. The syntax is similar to%Q.
>> %r(/home/#{foo})
=> "/\\/home\\/Foo/"


%s

Used for symbols. It ' s not subject to expression substitution or escape sequences.
>> %s(foo)
=> :foo
>> %s(foo bar)
=> :"foo bar"
>> %s(#{foo} bar)
=> :"\#{foo} bar"

String processing in Ruby%q,%q,%W,%W,%x,%r,%s usage