'MVC Data Annotations unexpected behaviors

I have my data annotation as below:

[RegularExpression("Basement|LL|Concourse|Plaza|1|2|3|4|5|6|7|8|9|10|14|15|16|17", ErrorMessage = "Enter Floor #, or Basement, LL, Concourse, Plaza")]
[Display(Name = "Floor")]
public string Floor { get; set; }

The page element:

@Html.TextBoxFor(m => m.Floor, new { @class = "form-control", id = "employeeFloor" })

Validation fails when I enter 10, 14, 15, 16, or 17. What am I doing wrong here? TIA

model-view-controllerdata-annotationsclient-side-validation


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