jQuery validation to accept only three letters in a textbox -


this code. want add form validation accepts 3 letters. can 1 help? 

if ( unitbrief === "" ) {     $("#divvalidationmessageconfigurationtab").css('display' , 'inline');     $("#spnvalidationtext").text("unit brief required.");     $(".unitbrief").focus();     return; }

did mean this?

if( ! /^[a-z]{3}$/i.test(unitbrief) ) { ... not 3 letters ... }

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