Does the job

I’ve asked the owner to modify the regex when searching for interface names. The script at the moment only matches interfaces index numbers 1-9.
http://www.net-snmp.org/docs/mibs/interfaces.html
shows ifTable indexes can be 1-2147483647.

I’ve requested the regex under line 69:
if ( $line =~ m/$OID_networkInterfaces.([0-9]) = STRING: (.*)/ )

to be modified to

if ( $line =~ m/$OID_networkInterfaces.([0-9]){1,10} = STRING: (.*)/ )

You can obviously do this yourself with a text editor when importing to nagios.