better regular expression?

[Vivek]

Hi,

I am trying to construct a regular expression using the re module that
matches for
1. my hostname
2. absolute from the root URLs including just "/"
3. relative URLs.

Basically I want the attern to not match for URLs that are not on my
host.

The following statement satisfies numbers 1 and 2, but not 3:

line =
re.sub(r'(href=")(http?://'+hostname+'[/]?|/)([^"]*?)(")',r'\1\2\3'+sInfo+r'\4',line)

An improvement that also partially satisfies number 3 is

line =
re.sub(r'(href=")(http?://'+hostname+'[/]?|/|[^h][^t][^t][^p][^:][^/][^/])([^"]*?)(")',r'\1\2\3'+sInfo+r'\4',line)

This is not complete because if the relative url is less than seven
characters, than it will not match.

Any suggestions?

Thanx.

 

[Andy Gross]

Check out the 'urlparse' module, in the standard library, unless for
some reason you *have* to use regular expressions.

/arg

 

[Roy Smith]

Hi,

I am trying to construct a regular expression using the re module that
matches for
1. my hostname
2. absolute from the root URLs including just "/"
3. relative URLs.

Is your goal to learn more about regexes, or to parse URLs? If the
latter, my suggestion would be to look at the urlparse module; the hard
work has already been done for you.