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Although it's not clear from the statement what remap the OP specically is asking for, I assume, from the given bag file that contains /ivar/testAccel, /ivar/testPoint, /ivar/testTopic, that OP wants to remap multiple topics by a single remap operation.

Although I'm not entirely sure (because the English statement and the example table in Remapping Arguments wiki page is very hard to understand for me), I don't think that is possible. My understanding is that remap in launch file works for the full exact name.

Using the example OP provides (with a little modifition done by me), the following worked on my Ubuntu 14.04 - Indigo computer.

<launch>
    <arg name="file" default="$(find foobar)/myRecord.bag" />
    <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="-l --clock $(arg file)">
        <remap from="/ivar" to="/playback/ivar"/>                      <!-- This does NOT remap. -->
        <remap from="/ivar/testPoint" to="/playback/ivar/testPoint"/>  <!-- This DOES remap. -->
    </node>
</launch>

Although it's not clear from the statement what remap the OP specically is asking for, I assume, from the given bag file that contains /ivar/testAccel, /ivar/testPoint, /ivar/testTopic, that OP wants to remap multiple topics by a single remap operation.

Although I'm not entirely sure (because the English statement and the example table in Remapping Arguments wiki page is very hard to understand for me), I don't think that is possible. My understanding is that remap in launch file works for the full exact name.

Using the example OP provides (with a little modifition done by me), the following worked on my Ubuntu 14.04 - Indigo computer.

<launch>
   <arg name="file" default="$(find foobar)/myRecord.bag" />
   <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="-l --clock $(arg file)">
     <remap from="/ivar" to="/playback/ivar"/>                      <!-- This does NOT remap. -->
     <remap from="/ivar/testPoint" to="/playback/ivar/testPoint"/>  <!-- This DOES remap. -->
   </node>
</launch>

Although it's not clear from the statement what remap the OP specically is asking for, I assume, for specically, from the given bag file that contains /ivar/testAccel, /ivar/testPoint, /ivar/testTopic, I assume that OP wants to remap multiple topics by a single remap operation.

Although I'm not entirely sure (because the English statement and the example table in Remapping Arguments wiki page is very hard to understand for me), I don't think that is possible. My understanding is that remap in launch file works for the full exact name.

Using the example OP provides (with a little modifition done by me), the following worked on my Ubuntu 14.04 - Indigo computer.

<launch>
  <arg name="file" default="$(find foobar)/myRecord.bag" />
  <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="-l --clock $(arg file)">
    <remap from="/ivar" to="/playback/ivar"/>                      <!-- This does NOT remap. -->
    <remap from="/ivar/testPoint" to="/playback/ivar/testPoint"/>  <!-- This DOES remap. -->
  </node>
</launch>

Although it's not clear from the statement what remap the OP is asking for specically, from the given bag file that contains /ivar/testAccel, /ivar/testPoint, /ivar/testTopic, I assume that OP wants to remap multiple topics by a single remap operation.

Although I'm not entirely sure (because I have a trouble understinding the English statement and the example table in Remapping Arguments wiki page is very hard to understand for me), ), I don't think that is possible. My understanding is that remap in launch file works for the full exact name.

Using the example OP provides (with a little modifition done by me), the following worked on my Ubuntu 14.04 - Indigo computer.

<launch>
  <arg name="file" default="$(find foobar)/myRecord.bag" />
  <node pkg="rosbag" type="play" name="playback" ns="myNamespace" args="-l --clock $(arg file)">
    <remap from="/ivar" to="/playback/ivar"/>                      <!-- This does NOT remap. -->
    <remap from="/ivar/testPoint" to="/playback/ivar/testPoint"/>  <!-- This DOES remap. -->
  </node>
</launch>