I'm trying to use regex to check that the first and last characters in a string are alpha characters between a-z.

I know this matches the first character:

```
/^[a-z]/i

```

But how do I then check for the last character as well?

This:

```
/^[a-z][a-z]$/i

```

does not work. And I suspect there should be something in between the two clauses, but I don't know what!