#!/usr/bin/env entity
<object default-lang="python">
<window ondelete="entity:exit">
  <entry name="entry" text="" onchange="foo"/>
  <label name="label" text=""/>
</window>
<python>
def foo(node):
  import re
  c_exp = re.compile(".*")
  result = c_exp.match(node["text"])
  result = result.group()
  enode("label.label").attrib({"text": result})
</python>
</object>