asp.net mvc 3 - How to validate textbox in MVC3 that must contain string started with characters "PR" -

i new mvc3 , working mvc3 razor application. need validate textbox on view in such way that, textbox accept strings starting characters "pr" , 4th character of string must "2". great if helps me. in advance

well need regex. i'm not sure regex , string contains. if need have 2 matches in there, split , use 2 textboxes , join values on post.

viewmodel:

public class myviewmodel  {     [regularexpression("^pr[a-za-z0-9]", errormessage= "invalid text1")]     public string mytext1 { get; set; }      [regularexpression("^2[a-za-z0-9]", errormessage= "invalid text2")]     public string mytext2 { get; set; } } 

warning, regex may faulty. invite others edit/post comments , can update correct regex

view:

@model myproject.models.myviewmodel  @using (html.beginform()) {       @html.textboxfor(m => m.mytext1)      @html.textboxfor(m => m.mytext2)       <button type="submit">submit</button>  } 

hope helps