I am scraping data from the website and I need to iterate over pages, but instead of a counter they have an alphabetical index

```
    http://funny2.com/jokesb.htm'
    http://funny2.com/jokesc.htm')
    ...

```

But I can't figure out how to include the [a-z] iterator. I tried

```
    http://funny2.com/jokes^[a-z]+$.htm'

```

which didn't work.