gistfile1.txt

@groovy.transform.TypeChecked
def myMethod() {
  def s = 'The 3 quick\nbrown 4 fox'
  def expected = 'The _ QUICK|brown _ FOX|'
  def result = ''
  new StringReader(s).splitEachLine(~/\d/){ result += "${it[0]}_${it[1].toUpperCase()}|" }
  assert result == expected; result = ''
  new StringReader(s).splitEachLine(~/\d/){ parts -> result += "${parts[0]}_${parts[1].toUpperCase()}|" }
  assert result == expected; result = ''
  new StringReader(s).splitEachLine(~/\d/){ List parts -> result += "${parts[0]}_${parts[1].toUpperCase()}|" }
  assert result == expected; result = ''
  new StringReader(s).splitEachLine(~/\d/){ p1, p2 -> result += "${p1}_${p2.toUpperCase()}|" }
  assert result == expected; result = ''
  new StringReader(s).splitEachLine(~/\d/){ String p1, String p2 -> result += "${p1}_${p2.toUpperCase()}|" }
  assert result == expected; result = ''
  new StringReader(s).splitEachLine(~/\d/){ String p1 -> result += "${p1.toUpperCase()}|" }
  assert result == 'THE |BROWN |'; result = ''
}

myMethod()