How can I remove leading spaces?

I have a 40 page PDF and I used the Form Wizard to generate fields for me. I noticed that some of the fields have leading spaces in the name. These fields cannot be used via the doc.getField(name) syntax. It simply returns null.

If I manually rename the field and remove the leading space it works, but this would take a long time. Is there any way to programmatically refer to a field with a leading space in the name? Perhaps some sort of escape character for the space? Or can I refer to a field by index instead of name? (For example, I can use doc.getNthFieldName(index) but this just returns the name (with leading space). If I could have something like doc.getNthField(index) that would work too)

Thanks in advance.