Question

I have this ruby regex for validate that the user enter meta keywords separated by commas.

validates_format_of :tags, :with => /^\s*[A-Za-z0-9]+(\s*,\s*[A-Za-z0-9]+)*\s*$/u

I want add 2 conditions more to this regex:

• limit the keywords to 4 keywords.

• Add spanish characters like ñáéíóú with p{L}\s\p{N}

How can add this 2 conditions to this regex?
Thank you

Answer 1

Hey I think this regex will do the trick.

/^(([^,]+),){0,3}([^,]+)$/

You can put your validation like this:

validates_format_of :tags, :with => /^(([^,]+),){0,3}([^,]+)$/

Or with the validates method

validates :tags, format: {with: /^(([^,]+),){0,3}([^,]+)$/} 

Both will do the same

NOTE: You should check Rubular, it is a great Ruby regex online editor