Regex for last point or comma in string

Question

I'm looking for a regex with gives me the last occurance of a point or a comma in a string (whichever one is the further back)

From what I googled myself I got this one ([,\.])(?!.*\1) but this gives me two results per string which isnt what I wanted.

I hope somebody can help me as I'm struggeling for the correct keyword to google for.

Cheers and thank you very much in advance

Answer 1

This pattern ([,\.])(?!.*\1) matches the last comma or dot asserting not any of the 2 being present on the right anymore.

That can occur for both a dot and a comma so you could possibly get 2 matches.

If you want a single match, you can match one of them and assert no more occurrences of either one of them to the right using a negated character class [^,.\r\n]* matching any char except the listed characters.

Note that you don't need the capture group for a match only.

[,.](?=[^,.\r\n]*$)

See a regex demo.

Answer 2

In this regex pattern the first capturing group is the last comma or point in each line.
We achieve this by looking for a comma or point and not allowing a point, comma or line ending between it and the end of the line.

([.,])[^.,\n\r]*$