table.column==value will only show nodes where table.column is exactly value
table.column!=value will mask out nodes where table.column is exactly value
table.column=~regex will only show nodes where the table.column value matches regex
table.column!~regex will mask out nodes where the table.column value matches regex
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@2091 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
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