Removing last character from a line using regex

Question

I just started learning regex and I'm trying to understand how it possible to do the following:

If I have:

helmut_rankl:20Suzuki12
helmut1195:wasserfall1974
helmut1951:roller11

Get:

helmut_rankl:20Suzuki1
helmut1195:wasserfall197
helmut1951:roller1

I tried using .$ which actually match the last character of a string, but it doesn't match letters and numbers.

How do I get these results from the input?

Answer 1

You could match the whole line, and assert a single char to the right if you want to match at least a single character.

.+(?=.)

Regex demo

If you also want to match empty strings:

.*(?=.)