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fix regular expression and typos in day12 (regular-expressions) #619

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fix regular expression and typos in day12 (regular-expressions) #619

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6 changes: 3 additions & 3 deletions 12_Day_Regular_expressions/12_day_regular_expressions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -377,7 +377,7 @@ We can specify the length of the substring we look for in a text, using a curly

```js
const txt = 'This regular expression example was made in December 6, 2019.'
const pattern = /\\b\w{4}\b/g // exactly four character words
const pattern = /\b\w{4}\b/g // exactly four character words
const matches = txt.match(pattern)
console.log(matches) //['This', 'made', '2019']
```
Expand Down Expand Up @@ -442,7 +442,7 @@ console.log(result) // true
### Exercises: Level 1

1. Calculate the total annual income of the person from the following text. ‘He earns 4000 euro from salary per month, 10000 euro annual bonus, 5500 euro online courses per month.’
1. The position of some particles on the horizontal x-axis -12, -4, -3 and -1 in the negative direction, 0 at origin, 4 and 8 in the positive direction. Extract these numbers and find the distance between the two furthest particles.
2. The position of some particles on the horizontal x-axis -1, 2, -4, -3 and -1 in the negative direction, 0 at origin, 4 and 8 in the positive direction. Extract these numbers and find the distance between the two furthest particles.

```js
points = ['-1', '2', '-4', '-3', '-1', '0', '4', '8']
Expand Down Expand Up @@ -514,7 +514,7 @@ distance = 12

### Exercises: Level 3

1. Writ a function which cleans text. Clean the following text. After cleaning, count three most frequent words in the string.
1. Write a function which cleans text. Clean the following text. After cleaning, count three most frequent words in the string.

```js
sentence = `%I $am@% a %tea@cher%, &and& I lo%#ve %tea@ching%;. There $is nothing; &as& mo@re rewarding as educa@ting &and& @emp%o@wering peo@ple. ;I found tea@ching m%o@re interesting tha@n any other %jo@bs. %Do@es thi%s mo@tivate yo@u to be a tea@cher!?`
Expand Down