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Update 12_day_regular_expressions.md #796

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8 changes: 4 additions & 4 deletions 12_Day_Regular_expressions/12_day_regular_expressions.md
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Expand Up @@ -453,10 +453,10 @@ distance = 12
1. Write a pattern which identify if a string is a valid JavaScript variable

```sh
is_valid_variable('first_name') # True
is_valid_variable('first-name') # False
is_valid_variable('1first_name') # False
is_valid_variable('firstname') # True
is_valid_variable('first_name') // True
is_valid_variable('first-name') // False
is_valid_variable('1first_name') // False
is_valid_variable('firstname') // True
```

### Exercises: Level 2
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