[Microsoft][ODBC SQL Server Driver][SQL Server][0122]USAGE: InvokeStoredProcedure [param1], [param2], [param3], [param3]

##</code><code>##

$errmsg =~ /^      # start at beginning of string
             (     # capture first group
              \[   # an opening square bracket
              \w+  # followed by one or more word charrs
              ]    # followed by a closing square bracket
             )     # close first capture
              {1}  # capture should be 1 time 
             (     # begin second capture
              .+   # match anything else 1 or more times
             )     # close second capture
           /x;

# which gives $1 = [Microsoft], $2 = everything else