php - Check Input contain Text and Number using JavaScript -

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i have input text field in webpage. need validate field field contain both text , numbers. ie input box if cost need validate if cost in format of '100 r'

i have validated number, how can validate text , number

var number = document.forms["myform"]["cost"].value;  if (isnan(number)) {     alert("cost must in number");      document.myform.cost.focus()      return false; }


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