bwgoudey wrote:
I have a lot of if/elif cases based on regular expressions that I'm using to
filter stdin and using print to stdout. Often I want to print something
matched within the regular expression and the moment I've got a lot of cases
like:
...
elif re.match("^DATASET:\s*(.+) ", line):
m=re.match("^DATASET:\s*(.+) ", line)
print m.group(1))
which is ugly because of the duplication but I can't think of a nicer of way
of doing this that will allow for a lot of these sorts of cases. Any
suggestions?
I've done this in the past with re-to-function pairings:
def action1(matchobj):
print matchobj.group(1)
def action2(matchobj):
print matchobj.group(3)
# ... other actions to perform
searches = [
(re.compile(PATTERN1), action1),
(re.compile(PATTERN2), action2),
# other pattern-to-action pairs
]
# ...
line = ...
for regex, action in searches:
m = regex.match(line)
if m:
action(m)
break
else:
no_match(line)
(note that that's a for/else loop, not an if/else pair)
-tkc
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