Remove text after specific string

Hi again,

How I can remove all text in the comment field, that come after a specific string (say in my case: '

').

I've tried:

/t/13292/1

Replacing what correspond, with no success, not knowing what I'm doing wrong !!!???

Any suggestion, thanks...

remove everything after

including
:
$regexp(%fieldname%,
.*,)

remove everything after

:
$regexp(%fieldname%,(
).*,$1)

That's it... Thank you pone.