5kyu_MatchingAndSubtituting.js

// 5kyu - Matching And Substituting

// I got lots of files beginning like this:

// Program title: Primes
// Author: Kern
// Corporation: Gold
// Phone: +1-503-555-0091
// Date: Tues April 9, 2005
// Version: 6.7
// Level: Alpha
// Here we will work with strings like the string data above and not with files.

// The function change(s, prog, version) given:

// s=data, prog="Ladder" , version="1.1" will return:

// "Program: Ladder Author: g964 Phone: +1-503-555-0090 Date: 2019-01-01 Version: 1.1"

// Rules:

// The date should always be "2019-01-01".

// The author should always be "g964".

// Replace the current "Program Title" with the prog argument supplied to your function. Also remove "Title", so in the example case "Program Title: Primes" becomes "Program: Ladder".

// Remove the lines containing "Corporation" and "Level" completely.

// Phone numbers and versions must be in valid formats.

// A valid version in the input string data is one or more digits followed by a dot, followed by one or more digits. So 0.6, 5.4, 14.275 and 1.99 are all valid, but versions like .6, 5, 14.2.7 and 1.9.9 are invalid.

// A valid input phone format is +1-xxx-xxx-xxxx, where each x is a digit.

// If the phone or version format is not valid, return "ERROR: VERSION or PHONE".

// If the version format is valid and the version is anything other than 2.0, replace it with the version parameter supplied to your function. If it’s 2.0, don’t modify it.

// If the phone number is valid, replace it with "+1-503-555-0090".

// Note
// You can see other examples in the "Sample tests".

function change(s, prog, version) {
  let v = version;
  if (/Version: 2.0\n/.test(s))
      v = '2.0'; 
  if (!/Phone: (\+1-\d{3}-\d{3}-\d{4})\n/.test(s) || !/Version: \d+\.\d+\n/.test(s))
      return 'ERROR: VERSION or PHONE';
  return `Program: ${prog} Author: g964 Phone: +1-503-555-0090 Date: 2019-01-01 Version: ${v}`;

}