regex is not working in top level app

[Alex]

Bug report originally filed on git:

When using subapplications regexes, the top level url definitions behave differently then regexes in subapplications. This is an example based on code in http://webpy.org/cookbook/subapp.

<b>blog.py:</b>
<pre>
import web

urls = (
  "", "reblog",
  "/(blog|Blog)", "blog" #change from original
)

class reblog:
    def GET(self): raise web.seeother('/')

class blog:
    def GET(self, path):
        return "blog " + path

app_blog = web.application(urls, locals())
</pre>

<b>code.py</b>
<pre>
import web
import blog
urls = (
  "/(blog|Blog)", blog.app_blog, #change from original
   # "/blog", blog.app_blog,
  "/(.*)", "index"
)

class index:
    def GET(self, path):
        return "hello " + path

app = web.application(urls, locals())

if __name__ == "__main__":
    app.run()
</pre>

The regex /(blog|Blog) is the same in blog.py and code.py however request GET http://localhost:1111/blog/Blog does not return the expected result. If the regex is commented out in code.py and replaced with the line below it GET request returns an expected result.