En Sun, 02 Aug 2009 18:22:20 -0300, Victor Subervi
<victorsube...@gmail.com> escribió:
How do I search and replace something like this:
aLine = re.sub('[<]?[p]?[>]?<font size="h' + str(x) + '"[
a-zA-Z0-9"\'=:]*>[<]?[b]?[>]?', '<h' + str(x) + '>', aLine)
where RE *only* looks for the possibility of "<p>" at the beginning of
the
string; that is, not the individual components as I have it coded above,
but
the entire 3-character block?
An example would make it more clear; I think you want to match either
"<p><font size=...." or "<font size=....". In other words, "<p>" is
optional. Use a normal group or a non-capturing group:
r'(<p>)?<font size="...'
r'(?:<p>)?<font size="...'
That said, using regular expressions to parse HTML or XML is terribly
fragile; I'd use a specific tool (like BeautifulSoup, ElementTree, or lxml)
--
Gabriel Genellina
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