best way to do a series of regexp checks with groups

Nick Craig-Wood nick at craig-wood.com
Mon Jan 24 07:46:18 CET 2005


Mark Fanty <markfanty at yahoo.com> wrote:
>  In perl, I might do (made up example just to illustrate the point):
> 
>  if(/add (\d+) (\d+)/) {
>    do_add($1, $2);
>  } elsif (/mult (\d+) (\d+)/) {
>    do_mult($1,$2);
>  } elsif(/help (\w+)/) {
>    show_help($1);
>  }

There was a thread about this recently under the title

  "regular expression: perl ==> python"

Here is a different solution...

class Result:
    def set(self, value):
        self.value = value
        return value

m = Result()

if m.set(re.search(r'add (\d+) (\d+)', line)):
    do_add(m.value.group(1), m.value.group(2))
elif m.set(re.search(r'mult (\d+) (\d+)', line)):
    do_mult(m.value.group(1), m.value.group(2))
elif m.set(re.search(r'help (\w+)', line)):
    show_help(m.value.group(1))

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick



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