I have a file textFile.txt

```
abc_efg@qwe.asd
abc_aer@
@avret
afd_wer_asd@qweasd.zxcasd
wqe_a@qwea.cae
qwe.caer

```

I want to grep to get specific lines : 

```
abc_efg@qwe.asd
afd_wer_asd@qweasd.zxcasd
wqe_a@qwea.cae

```

That is the ones that have 

```
[a-z]_[a-z]@[a-z].[a-z]

```

but the part before the `@` can have any number of "\_"

So far this is what I have : 

```
grep "[a-z]_[a-z]@[a-z].[a-z]" textFile.txt

```

But I got only one line as the output.

```
wqe_a@qwea.cae

```

Could I know a better way to do this ? :)