Help required in making a regular expression

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Hi,
I have the following schema definition :
The requirement is to not allow  leading and trailing spaces.

	<xsd:simpleType name=3D"Comment_T">
		<xsd:annotation>
			<xsd:documentation>
				Comment text
			</xsd:documentation>
		</xsd:annotation>
		<xsd:restriction base=3D"xsd:string">
			<xsd:maxLength value=3D"2000"/>
			<xsd:pattern value=3D"(\S(?:.*\S)?)"/>
		</xsd:restriction>
	</xsd:simpleType>

Now I need to change it so that following expression are also not
allowed : NONE, N/A, =3D, !=3D, <, >, <=3D, and >=3D
Note that The symbols shouldn't be contained in any part of the data
provided as part of Comment_T.
Thus a string like SNONE or sN/Ass or s<dd are also invalid values.

I am not able to make out the appropriate regular experession which
would meet this requirement.=20
I will appreciate any suggestions regarding this.

Thanks,
Satish Kataria



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