Simple Regex: match everything until the last dot

Question

Just want to match every character up to but not including the last period

 dog.jpg     -> dog
 abc123.jpg.jpg -> abc123.jpg

I have tried

(.+?)\.[^\.]+$

Answer 1

Use lookahead to assert the last dot character:

.*(?=\.)

Live demo.

Answer 2

This will do the trick

(.*)\.

Regex Demo

The first captured group contains the name. You can access it as $1 or \1 as per your language