Parse area code out of phone number

Question

I have a list of phone numbers which are formatted in multiple ways such as: `(212)-555-1234` or `212-555-1234` or `2125551234`. Using JavaScript, what would be the best way to extract only the area code out of these strings?

Accepted Answer

First, remove everything that is not a digit to get the plain number. Then, get the first three digits via slicing:

```
return myString.replace(/\D/g,'').substr(0, 3);
```

Parse area code out of phone number

Solution

Problem