Matt Wette <[EMAIL PROTECTED]> writes:
> Over the last few years I have converted from Perl and Scheme to
> Python. There one task that I do often that is really slick in Perl
> but escapes me in Python. I read in a text line from a file and check
> it against several regular expressions and do something once I find a match.
> For example, in perl ...
>
> if ($line =~ /struct {/) {
> do something
> } elsif ($line =~ /typedef struct {/) {
> do something else
> } elsif ($line =~ /something else/) {
> } ...
>
> I am having difficulty doing this cleanly in python. Can anyone help?
>
> rx1 = re.compile(r'struct {')
> rx2 = re.compile(r'typedef struct {')
> rx3 = re.compile(r'something else')
>
> m = rx1.match(line)
> if m:
> do something
> else:
> m = rx2.match(line)
> if m:
> do something
> else:
> m = rx3.match(line)
> if m:
> do something
> else:
> error
I usually define a class like this:
class Matcher:
def __init__(self, text):
self.m = None
self.text = text
def match(self, pat):
self.m = pat.match(self.text)
return self.m
def __getitem__(self, name):
return self.m.group(name)
Then, use it like
for line in fo:
m = Matcher(line)
if m.match(rx1):
do something
elif m.match(rx2):
do something
else:
error
--
|>|\/|<
David M. Cooke
cookedm(at)physics(dot)mcmaster(dot)ca
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