On 2022-08-20 21:51:41 -0000, Jon Ribbens via Python-list wrote: > On 2022-08-20, Stefan Ram <r...@zedat.fu-berlin.de> wrote: > > Jon Ribbens <jon+use...@unequivocal.eu> writes: > >>... or you could avoid all that faff and just do re.sub()?
> > source = '<a name="b" href="http" accesskey="c"></a>'
> >
> > # Use Python to change the source, keeping the order of attributes.
> >
> > result = re.sub( r'href\s*=\s*"http"', r'href="https"', source )
> > result = re.sub( r"href\s*=\s*'http'", r"href='https'", result )
Depending on the content of the site, this might replace some stuff
which is not a link.
> You could go a bit harder with the regexp of course, e.g.:
>
> result = re.sub(
> r"""(<\s*a\s+[^>]*href\s*=\s*)(['"])\s*OLD\s*\2""",
This will fail on:
<a alt="42 > 23" href="the.answer.html">
The problem can be solved with regular expressions (and given the
constraints I think I would prefer that to using Beautiful Soup), but
getting the regexps right is not trivial, at least in the general case.
It may become a lot easier if you know that certain conventions were
followed (e.g. that ">" was always written as ">") or it may become
even harder when the files contain errors.
hp
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_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | h...@hjp.at | -- Charles Stross, "Creative writing
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