From: Al on
Anyone have a regex pattern for deleting multiple backslashes e.g., \\\\\\\

I pretty good with regex; but, be damned if I can delete them with preg_replace()

I've tried "\\\\" as the manual says

preg_replace("/\\\\/", '', $str);

preg_replace("/(\\\\)+/", '', $str);

preg_replace("/\x5C/", '', $str);

preg_replace("/\\x5c/", '', $str);

And lots of others.

stripslashes() and stripcslashes() are limited.


From: Ashley Sheridan on
On Mon, 2010-03-15 at 15:03 -0400, Al wrote:

> Anyone have a regex pattern for deleting multiple backslashes e.g., \\\\\\\
>
> I pretty good with regex; but, be damned if I can delete them with preg_replace()
>
> I've tried "\\\\" as the manual says
>
> preg_replace("/\\\\/", '', $str);
>
> preg_replace("/(\\\\)+/", '', $str);
>
> preg_replace("/\x5C/", '', $str);
>
> preg_replace("/\\x5c/", '', $str);
>
> And lots of others.
>
> stripslashes() and stripcslashes() are limited.
>
>
>


What about this:

$str = 'text\\dfnfg\\dhdsg\\\\';
echo preg_replace('/\\\{2,}/', '', $str);

I think what was catching you out was that you were escaping the \ once
for the regex, but then it needed it again because it was in a single
quoted string, meaning 3 slashes in total. Took me a little while to
figure that out as well!

The {2,} part just tells it to only remove the slashes where they occur
in runs of two or more.

Thanks,
Ash
http://www.ashleysheridan.co.uk


From: Ashley Sheridan on
On Mon, 2010-03-15 at 15:35 -0400, Al Rider wrote:

>
>
> On 3/15/2010 3:11 PM, Ashley Sheridan wrote:
>
> > On Mon, 2010-03-15 at 15:03 -0400, Al wrote:
> >
> > > Anyone have a regex pattern for deleting multiple backslashes e.g., \\\\\\\
> > >
> > > I pretty good with regex; but, be damned if I can delete them with preg_replace()
> > >
> > > I've tried "\\\\" as the manual says
> > >
> > > preg_replace("/\\\\/", '', $str);
> > >
> > > preg_replace("/(\\\\)+/", '', $str);
> > >
> > > preg_replace("/\x5C/", '', $str);
> > >
> > > preg_replace("/\\x5c/", '', $str);
> > >
> > > And lots of others.
> > >
> > > stripslashes() and stripcslashes() are limited.
> > >
> > >
> > >
> > >
> >
> >
> > What about this:
> >
> > $str = 'text\\dfnfg\\dhdsg\\\\';
> > echo preg_replace('/\\\{2,}/', '', $str);
> >
> > I think what was catching you out was that you were escaping the \
> > once for the regex, but then it needed it again because it was in a
> > single quoted string, meaning 3 slashes in total. Took me a little
> > while to figure that out as well!
> >
> > The {2,} part just tells it to only remove the slashes where they
> > occur in runs of two or more.
> >
>
>
> I agree, it should work; but, it doesn't.
>
> Most everything that looks reasonable works in The Regex Coach,
> including you suggestion.
>
> I'm starting to think there is a bug in the regex engine; haven't
> looked yet. It's doubtful though because the bug would screw existing
> code.
>
> > Thanks,
> > Ash
> > http://www.ashleysheridan.co.uk
> >
> >
> >


I tried the code I just gave you and it's working, so I'm not sure now
what issue you're having with it?

Thanks,
Ash
http://www.ashleysheridan.co.uk


From: james stojan on
Double check your code I came up with the same solution as Ash did and it
worked fine in Wamp.

On Mon, Mar 15, 2010 at 3:30 PM, Ashley Sheridan
<ash(a)ashleysheridan.co.uk>wrote:

> On Mon, 2010-03-15 at 15:35 -0400, Al Rider wrote:
>
> >
> >
> > On 3/15/2010 3:11 PM, Ashley Sheridan wrote:
> >
> > > On Mon, 2010-03-15 at 15:03 -0400, Al wrote:
> > >
> > > > Anyone have a regex pattern for deleting multiple backslashes e.g.,
> \\\\\\\
> > > >
> > > > I pretty good with regex; but, be damned if I can delete them with
> preg_replace()
> > > >
> > > > I've tried "\\\\" as the manual says
> > > >
> > > > preg_replace("/\\\\/", '', $str);
> > > >
> > > > preg_replace("/(\\\\)+/", '', $str);
> > > >
> > > > preg_replace("/\x5C/", '', $str);
> > > >
> > > > preg_replace("/\\x5c/", '', $str);
> > > >
> > > > And lots of others.
> > > >
> > > > stripslashes() and stripcslashes() are limited.
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > > What about this:
> > >
> > > $str = 'text\\dfnfg\\dhdsg\\\\';
> > > echo preg_replace('/\\\{2,}/', '', $str);
> > >
> > > I think what was catching you out was that you were escaping the \
> > > once for the regex, but then it needed it again because it was in a
> > > single quoted string, meaning 3 slashes in total. Took me a little
> > > while to figure that out as well!
> > >
> > > The {2,} part just tells it to only remove the slashes where they
> > > occur in runs of two or more.
> > >
> >
> >
> > I agree, it should work; but, it doesn't.
> >
> > Most everything that looks reasonable works in The Regex Coach,
> > including you suggestion.
> >
> > I'm starting to think there is a bug in the regex engine; haven't
> > looked yet. It's doubtful though because the bug would screw existing
> > code.
> >
> > > Thanks,
> > > Ash
> > > http://www.ashleysheridan.co.uk
> > >
> > >
> > >
>
>
> I tried the code I just gave you and it's working, so I'm not sure now
> what issue you're having with it?
>
> Thanks,
> Ash
> http://www.ashleysheridan.co.uk
>
>
>
From: Al on


On 3/15/2010 3:30 PM, Ashley Sheridan wrote:
> On Mon, 2010-03-15 at 15:35 -0400, Al Rider wrote:
>
>>
>>
>> On 3/15/2010 3:11 PM, Ashley Sheridan wrote:
>>
>>> On Mon, 2010-03-15 at 15:03 -0400, Al wrote:
>>>
>>>> Anyone have a regex pattern for deleting multiple backslashes e.g., \\\\\\\
>>>>
>>>> I pretty good with regex; but, be damned if I can delete them with preg_replace()
>>>>
>>>> I've tried "\\\\" as the manual says
>>>>
>>>> preg_replace("/\\\\/", '', $str);
>>>>
>>>> preg_replace("/(\\\\)+/", '', $str);
>>>>
>>>> preg_replace("/\x5C/", '', $str);
>>>>
>>>> preg_replace("/\\x5c/", '', $str);
>>>>
>>>> And lots of others.
>>>>
>>>> stripslashes() and stripcslashes() are limited.
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> What about this:
>>>
>>> $str = 'text\\dfnfg\\dhdsg\\\\';
>>> echo preg_replace('/\\\{2,}/', '', $str);
>>>
>>> I think what was catching you out was that you were escaping the \
>>> once for the regex, but then it needed it again because it was in a
>>> single quoted string, meaning 3 slashes in total. Took me a little
>>> while to figure that out as well!
>>>
>>> The {2,} part just tells it to only remove the slashes where they
>>> occur in runs of two or more.
>>>
>>
>>
>> I agree, it should work; but, it doesn't.
>>
>> Most everything that looks reasonable works in The Regex Coach,
>> including you suggestion.
>>
>> I'm starting to think there is a bug in the regex engine; haven't
>> looked yet. It's doubtful though because the bug would screw existing
>> code.
>>
>>> Thanks,
>>> Ash
>>> http://www.ashleysheridan.co.uk
>>>
>>>
>>>
>
>
> I tried the code I just gave you and it's working, so I'm not sure now
> what issue you're having with it?
>
> Thanks,
> Ash
> http://www.ashleysheridan.co.uk
>
>
>

Thanks ever so much guys. Sometimes it's helpful when someone else confirms
something must work.

Problem was that I had a series of cleanup and security checks on a POST array
and inadvertently used the original POST array in one of the steps following the
backslash remove step, so obviously it didn't work.