Q:

awk remove lines with digits at end

I want to remove lines with digits at the end of the string,
example of input:
example123
example
example12
example43

expected output:
example

A:

Very simple to do:
awk '/[^0-9]$/ { print }' inputfile

Or, if you care to preserve empty lines, 
awk '!  /[0-9]$/ { print }' inputfile

