extraMatches.js

/**Extract Matches
So far, you have only been checking if a pattern exists or not within a string. You can also extract the actual matches you found with the .match() method.

To use the .match() method, apply the method on a string and pass in the regex inside the parentheses. Here's an example:

"Hello, World!".match(/Hello/);
// Returns ["Hello"]
let ourStr = "Regular expressions";
let ourRegex = /expressions/;
ourStr.match(ourRegex);
// Returns ["expressions"]

Apply the .match() method to extract the word coding. */

let extractStr = "Extract the word 'coding' from this string.";
let codingRegex = /coding/; // Change this line
let result = extractStr.match(codingRegex); // Change this line

ignoreCaseWhileMatching.js

/**Ignore Case While Matching
Up until now, you've looked at regexes to do literal matches of strings. But sometimes, you might want to also match case differences.

Case (or sometimes letter case) is the difference between uppercase letters and lowercase letters. Examples of uppercase are "A", "B", and "C". Examples of lowercase are "a", "b", and "c".

You can match both cases using what is called a flag. There are other flags but here you'll focus on the flag that ignores case - the i flag. You can use it by appending it to the regex. An example of using this flag is /ignorecase/i. This regex can match the strings "ignorecase", "igNoreCase", and "IgnoreCase".


Write a regex fccRegex to match "freeCodeCamp", no matter its case. Your regex should not match any abbreviations or variations with spaces. */

let myString = "freeCodeCamp";
let fccRegex = /freeCodeCamp/i; // Change this line
let result = fccRegex.test(myString);

matchCharactersThatOccurOneOrMoreTimes.js

/**Match Characters that Occur One or More Times
Sometimes, you need to match a character (or group of characters) that appears one or more times in a row. This means it occurs at least once, and may be repeated.

You can use the + character to check if that is the case. Remember, the character or pattern has to be present consecutively. That is, the character has to repeat one after the other.

For example, /a+/g would find one match in "abc" and return ["a"]. Because of the +, it would also find a single match in "aabc" and return ["aa"].

If it were instead checking the string "abab", it would find two matches and return ["a", "a"] because the a characters are not in a row - there is a b between them. Finally, since there is no "a" in the string "bcd", it wouldn't find a match.


You want to find matches when the letter s occurs one or more times in "Mississippi". Write a regex that uses the + sign. */

let difficultSpelling = "Mississippi";
let myRegex = /s+/g; // Change this line
let result = difficultSpelling.match(myRegex);

matchCharactersThatOccurZeroOrMoreTimes.js

/**Match Characters that Occur Zero or More Times
The last challenge used the plus + sign to look for characters that occur one or more times. There's also an option that matches characters that occur zero or more times.

The character to do this is the asterisk or star: *.

let soccerWord = "gooooooooal!";
let gPhrase = "gut feeling";
let oPhrase = "over the moon";
let goRegex = /go*/  /*;
soccerWord.match(goRegex); // Returns ["goooooooo"]
gPhrase.match(goRegex); // Returns ["g"]
oPhrase.match(goRegex); // Returns null

Create a regex chewieRegex that uses the * character to match all the upper and lower"a" characters in chewieQuote. Your regex does not need flags, and it should not match any of the other quotes. */

let chewieQuote = "Aaaaaaaaaaaaaaaarrrgh!";
let chewieRegex = /Aa*/; // Change this line
let result = chewieQuote.match(chewieRegex);

matchLettersOfTheAlphabet.js

/**Match Letters of the Alphabet
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

Match all the letters in the string quoteSample.

Note
Be sure to match both upper- and lowercase letters. */

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

matchLiteralStrings.js

/**Match Literal Strings
In the last challenge, you searched for the word "Hello" using the regular expression /Hello/. That regex searched for a literal match of the string "Hello". Here's another example searching for a literal match of the string "Kevin":

let testStr = "Hello, my name is Kevin.";
let testRegex = /Kevin/;
testRegex.test(testStr);
// Returns true
Any other forms of "Kevin" will not match. For example, the regex /Kevin/ will not match "kevin" or "KEVIN".

let wrongRegex = /kevin/;
wrongRegex.test(testStr);
// Returns false
A future challenge will show how to match those other forms as well.


Complete the regex waldoRegex to find "Waldo" in the string waldoIsHiding with a literal match. */

let waldoIsHiding = "Somewhere Waldo is hiding in this text.";
let waldoRegex = /Waldo/; // Change this line
let result = waldoRegex.test(waldoIsHiding);

matchNumbersAndLettersOfTheAlphabet.js

/**Match Numbers and Letters of the Alphabet
Using the hyphen (-) to match a range of characters is not limited to letters. It also works to match a range of numbers.

For example, /[0-5]/ matches any number between 0 and 5, including the 0 and 5.

Also, it is possible to combine a range of letters and numbers in a single character set.

let jennyStr = "Jenny8675309";
let myRegex = /[a-z0-9]/ig;
// matches all letters and numbers in jennyStr
jennyStr.match(myRegex);

Create a single regex that matches a range of letters between h and s, and a range of numbers between 2 and 6. Remember to include the appropriate flags in the regex. */

let quoteSample = "Blueberry 3.141592653s are delicious.";
let myRegex = /[h-s2-6]/ig; // Change this line
let result = quoteSample.match(myRegex); // Change this line

matchSingleCharactersNotSpecified.js

/**Match Single Characters Not Specified
So far, you have created a set of characters that you want to match, but you could also create a set of characters that you do not want to match. These types of character sets are called negated character sets.

To create a negated character set, you place a caret character (^) after the opening bracket and before the characters you do not want to match.

For example, /[^aeiou]/gi matches all characters that are not a vowel. Note that characters like ., !, [, @, / and white space are matched - the negated vowel character set only excludes the vowel characters.


Create a single regex that matches all characters that are not a number or a vowel. Remember to include the appropriate flags in the regex. */

let quoteSample = "3 blind mice.";
let myRegex = /[^aeiou^0-99]/ig; // Change this line
let result = quoteSample.match(myRegex); // Change this line

matchSingleCharakterWithMultiplePossibilities.js

/**Match Single Character with Multiple Possibilities
You learned how to match literal patterns (/literal/) and wildcard character (/./). Those are the extremes of regular expressions, where one finds exact matches and the other matches everything. There are options that are a balance between the two extremes.

You can search for a literal pattern with some flexibility with character classes. Character classes allow you to define a group of characters you wish to match by placing them inside square ([ and ]) brackets.

For example, you want to match "bag", "big", and "bug" but not "bog". You can create the regex /b[aiu]g/ to do this. The [aiu] is the character class that will only match the characters "a", "i", or "u".

let bigStr = "big";
let bagStr = "bag";
let bugStr = "bug";
let bogStr = "bog";
let bgRegex = /b[aiu]g/;
bigStr.match(bgRegex); // Returns ["big"]
bagStr.match(bgRegex); // Returns ["bag"]
bugStr.match(bgRegex); // Returns ["bug"]
bogStr.match(bgRegex); // Returns null

Use a character class with vowels (a, e, i, o, u) in your regex vowelRegex to find all the vowels in the string quoteSample.

Note
Be sure to match both upper- and lowercase vowels. */

let quoteSample = "Beware of bugs in the above code; I have only proved it correct, not tried it.";
let vowelRegex = /[aeiou]/ig; // Change this line
let result = quoteSample.match(vowelRegex); // Change this line

Regular Expression

/**Using the Test Method
Regular expressions are used in programming languages to match parts of strings. You create patterns to help you do that matching.

If you want to find the word "the" in the string "The dog chased the cat", you could use the following regular expression: /the/. Notice that quote marks are not required within the regular expression.

JavaScript has multiple ways to use regexes. One way to test a regex is using the .test() method. The .test() method takes the regex, applies it to a string (which is placed inside the parentheses), and returns true or false if your pattern finds something or not.

let testStr = "freeCodeCamp";
let testRegex = /Code/;
testRegex.test(testStr);
// Returns true

Apply the regex myRegex on the string myString using the .test() method. */
let myString = "Hello, World!";
let myRegex = /Hello/;
let result = myRegex.test(myString); // Change this line