test expression

const languages = [
  {
    name: 'C',
    year: 1972
  },
  {
    name: 'C#',
    year: 2000
  },
  {
    name: 'C++',
    year: 1983
  },
  {
    name: 'Clojure',
    year: 2007
  },
  {
    name: 'Elm',
    year: 2012
  },
  {
    name: 'Go',
    year: 2009
  },
  {
    name: 'Haskell',
    year: 1990
  },
  {
    name: 'Java',
    year: 1995
  },
  {
    name: 'Javascript',
    year: 1995
  },
  {
    name: 'Perl',
    year: 1987
  },
  {
    name: 'PHP',
    year: 1995
  },
  {
    name: 'Python',
    year: 1991
  },
  {
    name: 'Ruby',
    year: 1995
  },
  {
    name: 'Scala',
    year: 2003
  }
];


const regex = new RegExp('^' + 'on', 'i');

languages.filter(language => regex.test(language.name))