[PerlChina] wanna a regex expression

[=?GB2312?B?hWSEXoVk?=]

Sorry,I didn't see the problem clearly.

Thanks for zhang's remind. :)

On 8/24/06, Havel Zhang <havel.zhang at gmail.com> wrote:
>
> hi wanliyou:
>   don't set it as global, may ignore the last replacement.
> yang wang to change 'how are you today ? "are you ok?" you are welcome!'     to
> ' how are hello today? "are you ok?" hello are welcome!'
> if you not using global, the last 'you' will be ignored.
>
> Havel Zhang
>
>
>
> On 8/24/06, …d„^…d <wanliyou at gmail.com> wrote:
> >
> > ~s# # #g
> >
> > ~s# # #
> >
> > Don't set it as global may help
> >
> >
> > On 8/23/06, Havel Zhang <havel.zhang at gmail.com > wrote:
> > >
> > >  hi yang:
> > >
> > >     you can using (?!...) regex extension solve this problem. like
> > > follows:
> > > #---------------------
> > > $a = 'how are you today ? "are you ok?" you are welcome!';
> > > $a =~ s/you(?!\sok\?)/hello/ig;
> > > print $a ."\n";
> > > #-------------------
> > > Outputs:
> > >  how are hello today ? "are you ok?" hello are welcome!
> > >  #-------------------
> > >
> > >
> > > other regEx extensions:
> > >
> > > (?= ... ) if  match ahead successfully, return true.
> > > (?!  ... ) if  match ahead failed, return true.
> > > (?<= ...) if match backwards successfully, return true.
> > > (?<! ... ) if match backwards failed, return true.
> > >
> > > Good, luck. :)
> > >
> > > Havel Zhang
> > >
> > >  On 8/23/06, ÑîÏþÁÁ < yang.liana at gmail.com > wrote:
> > >
> > > >        Hi, all!
> > >      suppose a src string like this: how are you today ? "are you ok?"
> > > you are welcome!
> > >      I want this string to be       : how are hello today? "are you
> > > ok?" hello are welcome!
> > >
> > >      I want to use just a regex express to do it. but i cant prevent
> > > from "are you ok?" being changed to be "are hello ok?".
> > >      I want to use the *Look ahead* or *Look behind* to solve it. can
> > > I ?
> > >
> > > Yang.liana
> > > Aug/23/2006
> > >
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> > >
> > >
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> >
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