Change 'Please match the format requested.' to something else?

Question

Is there an easy way to customise the message that appears when the pattern: "([A-Za-z0-9\-\_]+)" argument is not satisfied and this message appears:

e.g.

<%= f.text_field :username, pattern: "([A-Za-z0-9\-\_]+)" %>

Answer 1

You can add a "title" attribute to append on to that message:

<%= f.text_field :username, pattern: "([A-Za-z0-9\-\_]+)" , title: "Letters, numbers, hyphen, and underscore Only"%>

This will result in the following message:

Please match the format requested: Letters, numbers, hyphen, and underscore Only

Otherwise, for more custom messages, you can use client side validation (via javascript) server side validations (via rails and ActiveModel)