Regex in rails

Ruby match word in string

text = "A regular expression is a sequence of characters that define a search pattern."

puts 'Found "A" at the beginning of the string.' if text.match(/^A/)
puts 'Found "O" at the beginning of the string.' if text.match(/^O/)

puts 'Found the string "character".' if text.match(/character/)
puts 'Found the word "character".' if text.match(/character\b/)

Source: ruby-for-beginners.rubymonstas.org

Rails where regex

@max_draw = Drawing.where("drawing_number ~* ?", '^A\d{4}$')

Source: stackoverflow.com

Regex in rails

Model.where("column ~* ?", ''^A\d{4}$'')

^ - string start anchor
A - literal "A"
\d+ - one or more digits (0-9)
\d{4} - exactly four digits
$ - string end anchor

Basically, the regex reads "the string should start with an A, followed by 
four digits and then the string should end". The final query line is:

@max_draw = Drawing.where("drawing_number ~* ?", '^A\d{4}$')

Source: stackoverflow.com

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