bite_size_js.tar.gz

RunNode12

Regular Expressions, also known as Regex, come in handy in a multitude of text processing scenarios. Regex defines a search pattern using symbols and allows you to find matches within strings. The applications of this span from software engineering to data science and beyond.

In this course, you will begin with an introduction to regex, its history, and various types of regular expressions. 

You will then learn how to create your own regular expressions using various techniques and special characters. In the latter half of the course, you will explore RegExp Objects, how to parse data, turn phrases into an array of strings, and lastly password and email pattern matching.

By the end of this course, you will be a regular expressions expert.

JavaScript Regular Expressions in Detail

Flags are provided as part of the expression with the object notation when a RegExp object is being created.  

Flags are provided as part of the expression with the object notation when a RegExp object is being created.

```shell
[ 'foo',
  index: 6,
  input: 'table football, foosball',
  groups: undefined ]
[ 'foo',
  index: 16,
  input: 'table football, foosball',
  groups: undefined ]
```


```shell
[ 'foo',
  index: 6,
  input: 'table football, foosball',
  groups: undefined ]
[ 'foo',
  index: 6,
  input: 'table football, foosball',
  groups: undefined ]
```


```shell
[ 'foo',
  index: 16,
  input: 'table football, foosball',
  groups: undefined ]
```


What will be the output of the following code?

```javascript
const regex2 = new RegExp( 'foo', 'g');
const str = 'table football, foosball';

while(regex2.test(str)){
    console.log(regex2.exec(str))
}
```



What will be the output of the following code?
<pre><code class="language-javascript">const regex2 = new RegExp( 'foo', 'g');
const str = 'table football, foosball';

while(regex2.test(str)){
 console.log(regex2.exec(str))
}
</code></pre>

Fill in the blank: 

The _________ method performs a search in a specified string to the full extent of the expression (meaning if there are capturing groups, they’ll also be taken into account).

Fill in the blank:
The _________ method performs a search in a specified string to the full extent of the expression (meaning if there are capturing groups, they’ll also be taken into account).

The internal state will not be kept, and the `lastIndex`  property will not be set.

There is no difference in the execution of the code. 

The internal state will be kept, but the `lastIndex` property will not be set.

The internal state will not be kept, but the `lastIndex` property will be updated.

What happens if the global flag is not specified for a RegExp object?

What happens if the global flag is not specified for a RegExp object?

Which of the following methods returns an iterator instead of a simple list of results, allowing you to use a `for…of` loop with the returned entity? 

Which of the following methods returns an iterator instead of a simple list of results, allowing you to use a <code>for…of</code> loop with the returned entity?

Challenge yourself by answering some questions regarding the RegExp object.



The Beginning of Regular Expressions

The Anatomy of Regular Expressions

The RegExp Object

Thinking in Regular Expressions

Regular Expressions in the Wild

Wrapping Up

Quiz on the RegExp Object