console.clear()

simpleStringReplace()

simpleRegexReplace()

globalRegexReplace()

regexReplaceGroup()

advancedRegexReplaceGroup()

simpleFunctionReplacer()

regexFunctionReplacerGroup()

console.log('Tests passed')

function simpleStringReplace() {

  var input = 'Perl is the best programming language'

  var expected = 'JavaScript is the best programming language'

  var result = input.replace('Perl', 'JavaScript')

  expect(result).toEqual(expected)

}

function simpleRegexReplace() {

  var input = 'My phone number is 123-555-3344'

  var expected = 'My phone number is xxx-xxx-xxxx'

  var result = input.replace(/\d{3}-\d{3}-\d{4}/, 'xxx-xxx-xxxx')

  expect(result).toEqual(expected)

}

function globalRegexReplace() {

  var input = 'The basketball is round, and the basketball is bouncy'

  var expected = 'The soccerball is round, and the soccerball is bouncy'

  var result = input.replace(/basketball/ig, 'soccerball')

  expect(result).toEqual(expected)

}

function regexReplaceGroup() {

  var input = 'Search with [Google](https://google.com), tweet with [Twitter](https://twitter.com)'

  var expected = 'Search with <a href="https://google.com">Google</a>, tweet with <a href="https://twitter.com">Twitter</a>'

  var result = input.replace(/\[(.*?)\]\((.*?)\)/g, '<a href="$2">$1</a>')

  expect(result).toEqual(expected)

}

function advancedRegexReplaceGroup() {

  var input = 'foobarbaz'

  var expected = 'foofoo-bar-$-bazbaz'

  var result = input.replace('bar', '$`-$&-$$-$\'')

  expect(result).toEqual(expected)

}

function simpleFunctionReplacer() {

  var input = 'theAnswerToLifeTheUniverseAndEverything'

  var expected = 'the-answer-to-life-the-universe-and-everything'

  var result = input.replace(/[A-Z]/g, upperToHyphenLower)

  expect(result).toEqual(expected)

  function upperToHyphenLower(match) {

    return '-' + match.toLowerCase();

  }

}

function regexFunctionReplacerGroup() {

  var input = 'These are the replacer arguments'

  var expected = 'These are the replacer arguments: replacer, arguments, 14, These are the replacer arguments'

  var result = input.replace(/(replacer) (arguments)/, replacer)

  expect(result).toEqual(expected)

  function replacer(match, group1, group2, offset, wholeString) {

    return match + ': ' + [group1, group2, offset, wholeString].join(', ')

  }

}

console.clear()

simpleStringReplace()

simpleRegexReplace()

globalRegexReplace()

regexReplaceGroup()

advancedRegexReplaceGroup()

simpleFunctionReplacer()

regexFunctionReplacerGroup()

console.log('Tests passed')

function simpleStringReplace() {

  var input = 'Perl is the best programming language'

  var expected = 'JavaScript is the best programming language'

  var result = input.replace('Perl', 'JavaScript')

  expect(result).toEqual(expected)

}

function simpleRegexReplace() {

  var input = 'My phone number is 123-555-3344'

  var expected = 'My phone number is xxx-xxx-xxxx'

  var result = input.replace(/\d{3}-\d{3}-\d{4}/, 'xxx-xxx-xxxx')

  expect(result).toEqual(expected)

}

function globalRegexReplace() {

  var input = 'The basketball is round, and the basketball is bouncy'

  var expected = 'The soccerball is round, and the soccerball is bouncy'

  var result = input.replace(/basketball/ig, 'soccerball')

  expect(result).toEqual(expected)

}

function regexReplaceGroup() {

  var input = 'Search with [Google](https://google.com), tweet with [Twitter](https://twitter.com)'

  var expected = 'Search with <a href="https://google.com">Google</a>, tweet with <a href="https://twitter.com">Twitter</a>'

  var result = input.replace(/\[(.*?)\]\((.*?)\)/g, '<a href="$2">$1</a>')

  expect(result).toEqual(expected);

// $2 --> (.*?) --> (https://google.com)

// $1 --> [.*?] --> [Google]

}

function advancedRegexReplaceGroup() {

  var input = 'foobarbaz'

  var expected = 'foofoo-bar-$-bazbaz'

  var result = input.replace('bar', '$`-$&-$$-$\'')

  expect(result).toEqual(expected)

}

function simpleFunctionReplacer() {

  var input = 'theAnswerToLifeTheUniverseAndEverything'

  var expected = 'the-answer-to-life-the-universe-and-everything'

  var result = input.replace(/[A-Z]/g, upperToHyphenLower)

  expect(result).toEqual(expected)

  function upperToHyphenLower(match) {

    return '-' + match.toLowerCase();

  }

}

function regexFunctionReplacerGroup() {

  var input = 'These are the replacer arguments'

  var expected = 'These are the replacer arguments: replacer, arguments, 14, These are the replacer arguments'

  var result = input.replace(/(replacer) (arguments)/, replacer)

  expect(result).toEqual(expected)

  function replacer(match, group1, group2, offset, wholeString) {

    return match + ': ' + [group1, group2, offset, wholeString].join(', ')

  }

}