[MySQL|Pandas] regex 
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```pythondata []
import pandas as pd

def find_valid_emails(users: pd.DataFrame) -> pd.DataFrame:
    return users.query(
        expr = "email.str.match(r'^\w*@[a-zA-Z].*\.com$')"
    ).sort_values(
        by = "user_id"
    )
```
```MySQL []
SELECT * 
FROM Users
WHERE email REGEXP '^[:word:]*@[a-zA-Z].*\.com'
ORDER BY 1
```
['Pandas']