fooList = get_objects_starting( 'foo' )
for obj in fooList:
    foo_exporter( obj )

barList = get_objects_starting( 'bar' )
for obj in barList:
    bar_exporter( obj )

import bpy
import fnmatch

scene = bpy.context.scene

foo_objs = [obj for obj in scene.objects if fnmatch.fnmatchcase(obj.name, "foo*")]

foo_objs = [obj for obj in scene.objects if obj.name.startswith("foo")]

import bpy

foo_objs = [obj for obj in bpy.data.objects if obj.name.startswith("foo")]