# File lib/facet/string/at_rand%21.rb, line 10
  def at_rand!(n=nil)
    separator = /\n+/ if separator == ''
    separator = /\s+/ unless separator
    n = n.to_i
    s,e = 0,0
    n.times { e = index( separator, s ) ;  s = e+1 }
    r = self[s...e]
    self[s...e] = ''
    return r
  end