podman

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package specgenutil
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import (
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	"fmt"
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	"github.com/docker/go-connections/nat"
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)
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func verifyExpose(expose []string) error {
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	// add the expose ports from the user (--expose)
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	// can be single or a range
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	for _, expose := range expose {
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		// support two formats for expose, original format <portnum>/[<proto>] or <startport-endport>/[<proto>]
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		_, port := nat.SplitProtoPort(expose)
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		// parse the start and end port and create a sequence of ports to expose
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		// if expose a port, the start and end port are the same
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		_, _, err := nat.ParsePortRange(port)
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		if err != nil {
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			return fmt.Errorf("invalid range format for --expose: %s: %w", expose, err)
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		}
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	}
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	return nil
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}
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