vhdl-testbench-dut-name

vhdl-testbench-dut-name is a variable defined in `vhdl-mode.el'.
Its value is

(".*" . "DUT")

Documentation:
Specifies how a DUT instance name is obtained.
The design-under-test instance name (i.e. the component instantiated in the
testbench) can be obtained by modifying the component name (e.g. attaching
or stripping off a substring).

FROM REGEXP is a regular expression matching the original name:
".*" matches the entire string
"\(...\)" matches a substring
TO STRING specifies the string to be inserted as new name:
"\&" means substitute entire matched text
"\N" means substitute what matched the Nth "\(...\)"
Examples:
".*" "\&" inserts original string
".*" "\&_i" attaches "_i" to original string
"\(.*\)_[io]$" "\1" strips off "_i" or "_o" from original string
".*" "foo" inserts constant string "foo"
".*" "" inserts empty string

You can customize this variable.