freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period.english.md

id	title	challengeType
587d7db5367417b2b2512b94	Match Anything with Wildcard Period	1

Description

Sometimes you won't (or don't need to) know the exact characters in your patterns. Thinking of all words that match, say, a misspelling would take a long time. Luckily, you can save time using the wildcard character: . The wildcard character . will match any one character. The wildcard is also called dot and period. You can use the wildcard character just like any other character in the regex. For example, if you wanted to match "hug", "huh", "hut", and "hum", you can use the regex /hu./ to match all four words.

let humStr = "I'll hum a song";
let hugStr = "Bear hug";
let huRegex = /hu./;
humStr.test(huRegex); // Returns true
hugStr.test(huRegex); // Returns true

Instructions

Complete the regex unRegex so that it matches the strings "run", "sun", "fun", "pun", "nun", and "bun". Your regex should use the wildcard character.

Tests

tests:
  - text: You should use the <code>.test()</code> method.
    testString: assert(code.match(/\.test\(.*\)/), 'You should use the <code>.test()</code> method.');
  - text: You should use the wildcard character in your regex <code>unRegex</code>
    testString: assert(/\./.test(unRegex.source), 'You should use the wildcard character in your regex <code>unRegex</code>');
  - text: Your regex <code>unRegex</code> should match <code>"run"</code> in <code>"Let us go on a run."</code>
    testString: assert(unRegex.test("Let us go on a run."), 'Your regex <code>unRegex</code> should match <code>"run"</code> in <code>"Let us go on a run."</code>');
  - text: Your regex <code>unRegex</code> should match <code>"sun"</code> in <code>"The sun is out today."</code>
    testString: assert(unRegex.test("The sun is out today."), 'Your regex <code>unRegex</code> should match <code>"sun"</code> in <code>"The sun is out today."</code>');
  - text: Your regex <code>unRegex</code> should match <code>"fun"</code> in <code>"Coding is a lot of fun."</code>
    testString: assert(unRegex.test("Coding is a lot of fun."), 'Your regex <code>unRegex</code> should match <code>"fun"</code> in <code>"Coding is a lot of fun."</code>');
  - text: Your regex <code>unRegex</code> should match <code>"pun"</code> in <code>"Seven days without a pun makes one weak."</code>
    testString: assert(unRegex.test("Seven days without a pun makes one weak."), 'Your regex <code>unRegex</code> should match <code>"pun"</code> in <code>"Seven days without a pun makes one weak."</code>');
  - text: Your regex <code>unRegex</code> should match <code>"nun"</code> in <code>"One takes a vow to be a nun."</code>
    testString: assert(unRegex.test("One takes a vow to be a nun."), 'Your regex <code>unRegex</code> should match <code>"nun"</code> in <code>"One takes a vow to be a nun."</code>');
  - text: Your regex <code>unRegex</code> should match <code>"bun"</code> in <code>"She got fired from the hot dog stand for putting her hair in a bun."</code>
    testString: assert(unRegex.test("She got fired from the hot dog stand for putting her hair in a bun."), 'Your regex <code>unRegex</code> should match <code>"bun"</code> in <code>"She got fired from the hot dog stand for putting her hair in a bun."</code>');
  - text: Your regex <code>unRegex</code> should not match <code>"There is a bug in my code."</code>
    testString: assert(!unRegex.test("There is a bug in my code."), 'Your regex <code>unRegex</code> should not match <code>"There is a bug in my code."</code>');
  - text: Your regex <code>unRegex</code> should not match <code>"Catch me if you can."</code>
    testString: assert(!unRegex.test("Can me if you can."), 'Your regex <code>unRegex</code> should not match <code>"Catch me if you can."</code>');

Challenge Seed

let exampleStr = "Let's have fun with regular expressions!";
let unRegex = /change/; // Change this line
let result = unRegex.test(exampleStr);

Solution

let exampleStr = "Let's have fun with regular expressions!";
let unRegex = /.un/; // Change this line
let result = unRegex.test(exampleStr);