[BUG] Unable to use existing eventgen.conf from 5.x with 6.x or 7.x

[ryanfaircloth]

Describe the bug
Regex syntax of stanzas are no longer supported

To Reproduce
See Splunk-TA-juniper

Expected behavior
stanzas should be applied based on regex match to sample name as with EG5.x

Actual behavior
No events are generated

Screenshots
If applicable, add screenshots to help explain your problem.

Sample files and eventgen.conf file
Please attach your sample files and eventgen conf file

Do you run eventgen with SA-eventgen?
Yes/No(No means you run eventgen with pip module mode)

If you are using SA-Eventgen with Splunk (please complete the following information):

• OS: [e.g. Windows/Mac OS 10.14]
• Browser [e.g. chrome, safari]
• Eventgen Version [e.g. 22]
• Splunk Version[e.g. 7.1.3]
• What other apps you have installed in Splunk etc/apps?

If you are using eventgen with pip module mode (please complete the following information):

• python version: [e.g. 2.6]
• OS: [e.g. Windows10]
• Virtual Env is used: Yes/No
• Eventgen Version [e.g. 6.3.2]

Additional context
Add any other context about the problem here.

[satellite-no]

Is this planned to be fixed soon? Very annoying bug!