Defining a Regexp

A Regexp can be created in three different ways in Ruby.

using slashes: / /
using %r{}
using Regex.new

#The following forms are equivalent
regexp_slash = /hello/
regexp_bracket = %r{hello}
regexp_new = Regexp.new('hello')

string_to_match = "hello world!"

#All of these will return a truthy value
string_to_match =~ regexp_slash    # => 0
string_to_match =~ regexp_bracket  # => 0
string_to_match =~ regexp_new      # => 0

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