freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
587d7db5367417b2b2512b96	Match Letters of the Alphabet	1	301354	match-letters-of-the-alphabet

--description--

You saw how you can use character sets to specify a group of characters to match, but that's a lot of typing when you need to match a large range of characters (for example, every letter in the alphabet). Fortunately, there is a built-in feature that makes this short and simple.

Inside a character set, you can define a range of characters to match using a hyphen character: -.

For example, to match lowercase letters a through e you would use [a-e].

let catStr = "cat";
let batStr = "bat";
let matStr = "mat";
let bgRegex = /[a-e]at/;
catStr.match(bgRegex); // Returns ["cat"]
batStr.match(bgRegex); // Returns ["bat"]
matStr.match(bgRegex); // Returns null

--instructions--

Match all the letters in the string quoteSample.

Note: Be sure to match both uppercase and lowercase letters.

--hints--

Your regex alphabetRegex should match 35 items.

assert(result.length == 35);

Your regex alphabetRegex should use the global flag.

assert(alphabetRegex.flags.match(/g/).length == 1);

Your regex alphabetRegex should use the case insensitive flag.

assert(alphabetRegex.flags.match(/i/).length == 1);

--seed--

--seed-contents--

let quoteSample = "The quick brown fox jumps over the lazy dog.";
let alphabetRegex = /change/; // Change this line
let result = alphabetRegex; // Change this line

--solutions--

let quoteSample = "The quick brown fox jumps over the lazy dog.";
let alphabetRegex = /[a-z]/gi; // Change this line
let result = quoteSample.match(alphabetRegex); // Change this line