I guess it depends on your needs... one thing that might work is to look for a character anything but a number at the end?
root# show | match "1.1.1.1"
address 1.1.1.1/32;
address 1.1.1.11/32;
root# show | match "1.1.1.1[^0-9]"
address 1.1.1.1/32;
The '^' means any character except the one inside the brackets...
hoping others will chime in.
Regards,
Sam