rails validation error with decimal

chore.rb

class Chore < ActiveRecord::Base
	belongs_to :user
	belongs_to :category
	validates :price, :format => { :with => /\A\d{1,9}\.\d{0,2}\z/, :message => 'regex failed'}, :numericality => {:greater_than => 0}
	validates :category, presence: true
	validates :user, presence: true
end

chores_controller.rb

# GET /chores/1/edit
  def edit
    @categories = Category.where(:is_active => true)
  end
  
# PATCH/PUT /chores/1
  # PATCH/PUT /chores/1.json
  def update
    respond_to do |format|
      if @chore.valid? && @chore.update(chore_params)
        format.html { redirect_to @chore, notice: 'Chore was successfully updated.' }
        format.json { head :no_content }
      else
        logger.info @chore.errors.messages
        @categories = Category.where :is_active == true
        format.html { render action: 'edit' }
        format.json { render json: @chore.errors, status: :unprocessable_entity }
      end
    end
  end
  
# Never trust parameters from the scary internet, only allow the white list through.
def chore_params
  params.require(:chore).permit(:category_id, :title, :description, :price, :offers_accepted, :image_url, :location)
end

output.txt

  Parameters: {"utf8"=>"✓", "authenticity_token"=>"iwGAo/8hp+6wvdCxTFNfMApFAfZRmxo946ID7t37M+Y=", "chore"=>{"category_id"=>"1", "title"=>"some text woohoo", "image_url"=>"http://placekitten.com/100/100", "description"=>"some more text woohoo", "price"=>"35", "location"=>"90210", "offers_accepted"=>"0"}, "commit"=>"Update Chore", "id"=>"5"}