freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.md

id	title	challengeType	forumTopicId
587d7db9367417b2b2512ba5	Specify Upper and Lower Number of Matches	1	301367

--description--

Recall that you use the plus sign + to look for one or more characters and the asterisk * to look for zero or more characters. These are convenient but sometimes you want to match a certain range of patterns.

You can specify the lower and upper number of patterns with quantity specifiers. Quantity specifiers are used with curly brackets ({ and }). You put two numbers between the curly brackets - for the lower and upper number of patterns.

For example, to match only the letter a appearing between 3 and 5 times in the string "ah", your regex would be /a{3,5}h/.

let A4 = "aaaah";
let A2 = "aah";
let multipleA = /a{3,5}h/;
multipleA.test(A4); // Returns true
multipleA.test(A2); // Returns false

--instructions--

Change the regex ohRegex to match the entire phrase "Oh no" only when it has 3 to 6 letter h's.

--hints--

Your regex should use curly brackets.

assert(ohRegex.source.match(/{.*?}/).length > 0);

Your regex should not match "Ohh no"

assert(!ohRegex.test('Ohh no'));

Your regex should match "Ohhh no"

assert('Ohhh no'.match(ohRegex)[0].length === 7);

Your regex should match "Ohhhh no"

assert('Ohhhh no'.match(ohRegex)[0].length === 8);

Your regex should match "Ohhhhh no"

assert('Ohhhhh no'.match(ohRegex)[0].length === 9);

Your regex should match "Ohhhhhh no"

assert('Ohhhhhh no'.match(ohRegex)[0].length === 10);

Your regex should not match "Ohhhhhhh no"

assert(!ohRegex.test('Ohhhhhhh no'));

--seed--

--seed-contents--

let ohStr = "Ohhh no";
let ohRegex = /change/; // Change this line
let result = ohRegex.test(ohStr);

--solutions--

let ohStr = "Ohhh no";
let ohRegex = /Oh{3,6} no/; // Change this line
let result = ohRegex.test(ohStr);