Exercises 1

1.Create a regular expression literal that matches your surname in a test string.

Answer:

 var pattern = /rodriguez/; 

2.Use the testmethod to test your regular expression.

Answer:

var testString = "I am oscar rodriguez";
 var pattern = /rodriguez/; 

 console.log(pattern.test(testString)); // true

3.Create a regular expression that looks for characters “xyz” using the RegExp constructor.

Answer:

 var pattern = new RegExp('xyz'); 

Exercises 2

1.Create a regular expression that matches a word of your choice but is case-insensitive.

Answer:

 var pattern = /rodriguez/i; 

2.Create a regular expression that matches any sequence of two or more numbers up to a maximum of ten numbers.

Answer:

var textString = '123';
var pattern = /[0-9]{2,10}/;

console.log(pattern.test(textString)); // true 

3.Create a regular expression that looks for characters “xyz” using the RegExp constructor.

Answer:

var testString = '****';
var pattern = /\*+/;

console.log(pattern.test(testString)); //true

Exercises 3

1.Write a regular expression that matches 4-digit numbers in a test string. Use a capturing group and the exec method.

Answer:

var testString = '1212-1232-1232-4343',
    pattern = /(\d\d\d\d)/;
 
console.log(pattern.exec(testString)); // ["1212", "1212"]

2.Match the same 4-digit number as the previous exercise, but use the match method.

Answer:

var testString = '1212-1232-1232-4343',
    pattern = /(\d\d\d\d)+/g;
 
console.log(testString.match(pattern)); // ["1212", "1232", "1232", "4343"]

Exercises 4

1.Write a regular expression that matches words ending in the letters ing.

Answer:

 var pattern = /ing\b/i; 

2.Write a regular expression that matches the pattern XXX-XXX-XXX, where X may be any letter or number.

Answer:

var textString = '123';
var pattern = /[0-9a-zA-Z]{3}-[0-9a-zA-Z]{3}-[0-9a-zA-Z]{4}/;

console.log(pattern.test(textString)); // true 

3.Write a regular expression that matches US zip codes.

Answer:

var testString = '78644';
var pattern = /\d{5}/;

console.log(pattern.test(testString)); //true