title: How can I validate white space?
body: <p>I have to validate a <code>String</code> with only white spaces. In my <code>String</code> white spaces between a <code>String</code> is allowed but only white spaces not allowed. For example <code>"conditions apply"</code>,<code>"conditions"</code> etc is allowed but not <code>"  "</code>. ie, only white space not allowed</p>
  
  <p>I want a regular expression in JavaScript for this </p>