re.sub replacement text \-escapes woe

[Alexander Schmolck]

Sorry if I missed something obvious, but how do you do this more
intelligently?

def escape(s):
return re.sub(r'([${}\\])', r'\ \1', s).replace('\\ ', '\\')

'as

[Peter Otten]

Re: re.sub replacement text \-escapes woe

Alexander Schmolck wrote:
[color=blue]
> Sorry if I missed something obvious, but how do you do this more
> intelligently?
>
> def escape(s):
> return re.sub(r'([${}\\])', r'\ \1', s).replace('\\ ', '\\')
>
> 'as[/color]

Interesting. No direct attack, but another workaround:

re.sub(r'([${}\\])', lambda m: '\\' + m.group(), s)

Peter

[Peter Otten]

Re: re.sub replacement text \-escapes woe

Peter Otten wrote:
[color=blue]
> Alexander Schmolck wrote:
>[color=green]
>> Sorry if I missed something obvious, but how do you do this more
>> intelligently?
>>
>> def escape(s):
>> return re.sub(r'([${}\\])', r'\ \1', s).replace('\\ ', '\\')
>>
>> 'as[/color]
>
> Interesting. No direct attack, but another workaround:
>
> re.sub(r'([${}\\])', lambda m: '\\' + m.group(), s)[/color]

re.sub(r'([${}\\])', r'\\\1', s)

Either that or I'm slash-blind tonight...

Peter

[David M. Wilson]

Re: re.sub replacement text \-escapes woe

Alexander Schmolck wrote:[color=blue]
> Sorry if I missed something obvious, but how do you do this more
> intelligently?
>
> def escape(s):
> return re.sub(r'([${}\\])', r'\ \1', s).replace('\\ ', '\\')
>[/color]

re.escape? :)


David

[Alexander Schmolck]

Re: re.sub replacement text \-escapes woe

Peter Otten <__peter__@web. de> writes:
[color=blue]
> Peter Otten wrote:
>[color=green]
> > Alexander Schmolck wrote:
> >[color=darkred]
> >> Sorry if I missed something obvious, but how do you do this more
> >> intelligently?
> >>
> >> def escape(s):
> >> return re.sub(r'([${}\\])', r'\ \1', s).replace('\\ ', '\\')
> >>
> >> 'as[/color]
> >
> > Interesting. No direct attack, but another workaround:
> >
> > re.sub(r'([${}\\])', lambda m: '\\' + m.group(), s)[/color]
>
> re.sub(r'([${}\\])', r'\\\1', s)
>
> Either that or I'm slash-blind tonight...[/color]

D'oh -- slash-blindness is what happened to me (presumably because I was
unconsciously expecting a raw string when I tested the above in the
interactive console before I posted and thus incorrectly dismissed the
result).

Thanks

'as