when we want configure a community name with special characters , it doesn't allow because it shows the following message:
vyos@vyos# set service snmp community R0bb!nsRes@rch authorization rw Community string is limited to alphanumerical characters only with a total lenght of 100 Value validation failed Set failed
the regular expression should allow it , it works as expected 1.4.x
https://github.com/vyos/vyos-1x/blob/equuleus/interface-definitions/snmp.xml.in#L16