"Your string" =~ /string/

"Your string".rmatch? do "string" end

"abc".rmatch? { "ab" + "c" }

"abc".rmatch? { "xyz".or "abc" }

"symbols.*&+galore".rmatch? { ".*&+" }

"abc".rmatch? { "ab" + ( "z".or "c" ) }

"aaa".rmatch? { 1.or_more "a" }

"aaa".rmatch? { 5.or_less "a" }

"aaa".rmatch? { 3.exactly "a" }

"aaa".rmatch? { (1..5).of "a" }

"aaa".rmatch? { 0.or_more "a" }

"aaa".rmatch? { any "a" }

"aaa".rmatch? { 1.or_more "a" }

"aaa".rmatch? { some "a" }

"abc1234.&*".rmatch? { 10.exactly any_char }

"abc".rmatch? { 3.exactly letter }

"1234".rmatch? { 4.exactly digit }

"abc_123".rmatch? { 7.exactly word_char }

" ".rmatch? { whitespace }

"abc".rmatch? { 3.exactly "a".."c" }

"x".rmatch? { word_char.not "x" } # => nil

"y".rmatch? { word_char.not "x" }

"x".rmatch? { _not "x" } # => nil

"y".rmatch? { _not "x" }

match = "abc".rmatch do
  group( "a" + group( "b" ) ) + "c"
end

match.to_a #=> [ "abc", "ab", "b" ]

match = "abcde".rmatch? do
  group( :word, any( word_char ) )
end

match[ :word ] #=> "abcde"

match = "abcde".rmatch? do
  group :word do
    any word_char
  end
end

match[ :word ] #=> "abcde"

order = "1234567890       Central Processing"

match = order.rmatch? do
  group :serial do
    some digit
  end \
  + some whitespace + \
  group :source do
    any any_char
  end
end

puts "Order #" + match[ :serial ]
puts "Shipped from " + match[ :source ]