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<p style="margin: 10px 0 0 0">My reading of the following specs indicates that regular expressions are definitely out:</p>
<p style="margin: 10px 0 0 0"><a href="http://www.w3.org/TR/xmlschema-2/#anyURI" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://www.w3.org/TR/xmlschema-2/#anyURI</a><br /> <a href="http://www.ietf.org/rfc/rfc2396.txt" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://www.ietf.org/rfc/rfc2396.txt</a></p>
<p style="margin: 10px 0 0 0">In short, many of the useful characters that would be used in regular expressions are expressly forbidden to appear in a URI. Percent encoding is a possible workaround, but that would render the expressions unreadable and is a non-starter in my view.</p>
<p style="margin: 10px 0 0 0">Ant patterns like <a href="https://example.org/**" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://example.org/**</a> are valid URIs, but they really gain nothing more than path prefix matching.</p>
<p style="margin: 10px 0 0 0">I believe the following prefix matching strategy is both simple and flexible:</p>
<p style="margin: 10px 0 0 0">Parse the URI defined in the Location attribute and save the path element. Candidate service URLs would be similarly parsed and matched if and only if the scheme and authority match exactly and if the path element of the candidate starts with the path element of a defined entry. In the case of multiple matches, most specific (i.e. greatest length of matched path), would be returned.</p>
<p style="margin: 10px 0 0 0">That approach prevents domain spoofing and supports empty paths since all paths, including an empty path, would pass the "starts with" check above.</p>
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