Cisco TelePresence Administrator's Manual page 270

based authentication configuration
In the Regex field, use the (?<name>regex) syntax to supply names for capture groups so that
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matching sub-patterns can be substituted in the associated Username format field, for example,
/(Subject:.*, CN=(?<Group1>.*))/m.
Note that the regex defined here must conform to
The Username format field can contain a mixture of fixed text and the capture group names used in the
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Regex. Delimit each capture group name with #, for example, prefix#Group1#suffix. Each
capture group name will be replaced with the text obtained from the regular expression processing.
3. Click Check certificate.
4. The results of the test are shown in the Certificate test results section. The Resulting string item is the
username credential that would be checked against the relevant authorization mechanism to determine
that user's authorization (account access) level.
5. If necessary, you can modify the Regex and Username format fields and repeat the test until the correct
results are produced.
If the Certificate source is an uploaded PEM or plain text file, the selected file is temporarily uploaded
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to the VCS when the test is first performed:
if you want to keep testing different Regex and Username format combinations against the same
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file, you do not have to reselect the file for every test
if you change the contents of your test file on your file system, or you want to choose a different file,
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you must click Browse again and select the new or modified file to upload
6. If you have changed the Regex and Username format fields from their default values and want to use
these values in the VCS's actual configuration (as specified on the
configuration page) then click Make these settings permanent.
Note:
Any uploaded test file is automatically deleted from the VCS at the end of your login session.
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The regex is applied to a plain text version of an encoded certificate. The system uses the command
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openssl x509 -text -nameopt RFC2253 -noout to extract the plain text certificate from its
encoded format.
Cisco VCS Administrator Guide (X7.1)
page but you can change them as required.
PHP regex guidelines.
Certificate-based authentication
Maintenance
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