My regexp kung-fu is not the strongest, but it looks like you’ve only allowed for a single charachter here.
You may need to allow for some more
validates_format_of /[1]+$/
You may want to consider this around the other way though. Instead of forbidding chars, allow a restricted set.
validates_format_of /^\w+$/ will restrict the values allowable (maybe too much so). You’ll need to check the docs to tune it to your specific need.
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^thesechars ↩︎
