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Ruby regular expressions

str = "Ruby programming language is amazing!"

//.class  # => Regexp 

str =~ /R/    	#return the index of the first occurrence => 0
str =~ /m/	# => 11
/ing/ =~ str	# you can also flip it around => 13
"sky" =~ /[aeiou]/  # you can use a list of characters to match => nil
"love" =~ /[aeiou]/ # => 1
"%^%$%$" =~ /[a..z]/  # => nil
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