Ruby RegExp

In Ruby, Regular Expressions (shortened as RegExp), are used to describe and match patterns in strings. This functionality is housed in the Regexp class.

Syntax

Regular expressions can be created in three ways:

# With / /
regexp1 = /code/

# With %r{ }
regexp2 = %r{code}

# With Regexp.new()
regexp3 = Regexp.new("code")

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Finding Patterns in Strings

To see if a given string matches a regular expression, use .match().

puts regexp1.match("codecademy") # Output: code

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To test if there even was a match (true or false), use .match?():

puts regexp1.match?("codecademy") # Output: true

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