placing $ in regular expression

[Astropsyko]

Howdy all,

I am so new to schemas. I'd like to include the dollar sign, $, in my pattern element for a regular expression to define a price. Prices could be $100.50 or $45.99 Can anyone help? This is what I have:

<xs:simpleType name="priceType">
		<xs:restriction base="xs:string">
			<xs:pattern value="$\d+\.\d{2}"/>
		</xs:restriction>
</xs:simpleType>

Thanks,
astro