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From: Gary Wessle <phddas@yahoo.com>
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Subject: Re: regex replace
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"rgb" <rbielaws@i1.net> writes:

> Gary Wessle wrote:
> > Hi
> >
> > I need to remove the "//" from the beginning of all the lines in my
> > c++ code which contain the string 'n', including the single comma.
> > e.g, un-comment all of those lines that qualify. and then also to
> > place "//" not including the double quotes at the beginning of all
> > lines containing the 'f' string.
> >
> > this is a bit too much for me to come up with.
> >
> > thanks
> 
> C-M-% ^\(//\)\(.*'n',\)<RET>\2<RET>
> 
> C-M-% ^.*'f'<RET>//\0<RET>

    //    if( some switch->fd ) p_acc->sbs(a_f, morearg, somemore, 'n', 0); // no action taken

the first command you posted will not work on the above, even after I
modified it to take the spaces at the start like this.
C-M-% ^ *\(//\)\(.*'n',\)<RET>\2<RET>