Yardboy

Solved, with some help from StackOverflow that I apparently missed the first time around 
(http://stackoverflow.com/questions/2013124/regex-matching-up-to-the-first-occurrence-of-a-character):

/<simpleChoice[^>]*>/

Match "<simpleChoice" plus any and all characters that do not match ">" followed by a ">".

[^>]* is a set of "zero or more characters that do not match >"

Yardboy

<manifest>
<organization>
<item identifier="ITEM-6137565f-18fe-481f-b6ce-a290a354c862" isvisible="true">
  <title>Math</title>
  <item identifier="ITEM-5781bd41-7acd-4373-8ccd-37bd074c2461">
    <title>Grade 07</title>
    <item identifier="ITEM-d7035880-88a5-4501-9865-f6265ba8022c" identifierref="i-179211">
      <title>qti_200535.xml</title>
    </item>
    <item identifier="ITEM-b13ebebd-f942-4ee8-a342-e8c3913c9063" identifierref="i-194469">

Yardboy

<ul>
  <li>
    Level 1 Item 1
    <ul>
      <li>
        Level 1-1 Item 1
        <ul>
          <li>
            Level 1-1-1 Item 1
          </li>

Yardboy

#!/bin/bash
# Based on terrbear's "html2haml an entire directory" at http://terrbear.org/?p=277
# This script needs to be executable and located somewhere in your PATH

CMD=`basename $0`

if [ -z "$1" ]; then
  wdir="."
else
  wdir=$1