case insensitive query

[Peter Drake]

I need help understanding how to make a qstring expression case
insensitive.  Specifically, I am using this query:

qstring=('[NAME]'=~/^userenteredtext.*/)

and I would like the user entered text to be matched case insensitive.
 Also, is there any way to specify the field to search (eg. [NAME])
with a wildcard so that more than one field is searched or do I simply
need to build my qstring to test all of the fields (test each field
individually)?

Thanks for any help!
Peter