Use Either Regexp or Regexp_like() || Given both solutions || MySQL :
Code 1Code 2
# Code 1 
```
select user_id , email 
from Users 
where email regexp '^[A-Za-z0-9][A-Za-z0-9_]*@[A-Za-z]*[.]com$'
```
# Code 2 
``````
select user_id , email 
from Users  
where regexp_like(email , '^[A-Za-z0-9][A-Za-z0-9_]*@[A-Za-z]*[.]com$')

['MySQL']