Fields can have as many validators as you need on them. Empty fields are only validated if they are also required.
Between 3 and 6 characters allowed (customisable).
Only digits allowed.
Only alphanumeric characters allowed.
Only alphabet characters allowed.
Must be less than 3 numerically (customisable).
Must be greater than 3 numerically (customisable).
Must have between 5 and 10 words (customisable).
Must be one of the words 'theme', 'catcher' or 'quform' (customisable).
Must match the given regular expression pattern, in this example the pattern is /[\d+]/ which means the input must contain at least one digit.