function validate( node ) {
		var requirePath;
		if ( node.callee.name === 'require' ) {
			requirePath = node.arguments[ 0 ].value;
			if ( RE_INDEX.test( requirePath ) ) {
				report( node );
			}
		}
	}
Validates a `require` path.

@private
@param {ASTNode} node - node to examine