How to match route only if param is integer in Angular2?

For example this router

{
path: '/client',
component: ClientRootComponent,
children: [
{path: '', component: ClientListComponent},
{path: ':clientId', component: ClientOpenComponent, resolve: makeResolver(ClientOpenResolver)}
]
},
{
path: '**',
component: NotFoundComponent
}


will pass both URLs /client/1234 and /client/asdf to ClientOpenComponent. How I can make that /client/asdf will be matched as NotFound and passed to NotFoundComponent?

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