trim as regex in js

trim.js

function trim(str){
  return str.replace(/^\s*((?:.|\n)*?)\s*$/, "$1");
}


var testCases = [
  ["    a"    , "a"], 
  ["A    "    , "A"], 
  ["  a  "    , "a"], 
  ["a  b! "   , "a  b!"], 
  ["  .-    " , ".-"], 
  ["\nfoo"    , "foo"], 
  ["\t\t\n  You  \njust  \t ", "You  \njust"],
];

var testReport = testCases.map(function(test) {
  var [input, expected] = test;
  var output = trim(input);
  var successStr = output === expected ? "PASS" : "FAIL";
  return {
    result: successStr, 
    input: input, 
    expected: expected, 
    was: output
  };
});


testReport.filter(r => r.result === 'FAIL')