Validate Letters n Spaces

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This determines if the input contains the letters or spaces only.

Body Code:

this will validate the input contains only letters a-z, A-Z or spaces and nothing else.

<form name=f1>
<input type=text name=t1 value="abc def">
<input type=button value="click" onclick="doIt()">
function doIt()
  var _f=document.f1;
  var _exp4 = new RegExp(/^[a-z ]+$/i);
  var _test4 =_exp4.test(_f.t1.value);



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