Also, the name you're trying to extract seems wrong.
See the following quote from draft-ietf-abfab-gss-eap-naming:
The first portion of the name is urn:ietf:params:gss:radius-attribute
(a URN indicating that this is a GSS-EAP RADIUS AVP). This is
followed by a space and a numeric RADIUS name as described by
section
2.6 of [I-D.ietf-radext-radius-extensions]. For example the
name of
the User-Name attribute is
"urn:ietf:params:gss:radius-attribute 1".
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