Using regular expression on whole file

Hello,

I'm using a filesensor to detect if the last line of a file containss OK Or NOT_OK. This file is on append mode, added by a Windows Schedule Task.

The file is like this :

My Regex is .*;NOT_OK$

The alarm is triggered but when a new line is added, the alarm is not canceled.

I think the Regex is executed on each line of the file, and not on the whole content, even if i check "always transmis the whole file" in sensor options.

How can I do that ?