Does anyone has general online filtering signal MATLAB code?

I am measuring strain signals from the strain gauage. It has drifts in the measured signal. I have developed a offline filter to remove drifts present in the signal. The dc blocking filter concept have been used to remove the drifts in offline. Now, I would like to use the same filter for online filtering the input signal. I would like to check the online filtering for my signal as it is being measured and remove the drifts, if it occurs in the strain signal by setting threshold value of T = (mean ± 3*STD).

As i understand from the basic concept of online filtering, I need to use the windowing method and need take care of the buffer time of the each window length and not to deteriorate the original signal at the edges of the each window as there will be deterioration ‘transients’ at the beginning and the end points of the windows.

I was wondering if anyone has the general online filtering code developed in the MATLAB?If yes, Can you please share the matlab code for online filtering? Also, if someone has developed MATLAB code for online filtering of the signal in other applications, can you please share the code?