scanf style parsing

Andrei Kulakov sill at optonline.net
Thu Sep 27 19:53:48 CEST 2001


On Thu, 27 Sep 2001 11:32:35 +0000 (UTC), Duncan Booth <duncan at NOSPAMrcp.co.uk> wrote:
> tim at vegeta.ath.cx (Tim Hammerquist) wrote in 
> news:slrn9r61oo.uim.tim at vegeta.ath.cx:
> 
>> But don't think regex's are disposable just because Python's string type
>> is more convenient.  Consider the following:
>> 
>>     # perl
>>     if ($filename =~ /\.([ps]?html?|cgi|php[\d]?|pl)$/) { ... }
>>     # python
>>     re_web_files = re.compile(r'\.([ps]?html?|cgi|php[\d]?|pl)$')
>>     m = re_web_files.search(filename)
>>     if m:
>>         ...
>> 
>> This is a very complicated (but relatively efficient way) to match files
>> with all the folowing extensions:
>>     .htm    .html   .shtm   .shtml  .phtm   .phtml
>>     .cgi
>>     .php    .php2   .php3   .php4
>>     .pl
> 
> Wouldn't you be happier with this?:
> 
>    extensions = ['.htm', '.html', '.shtm', '.shtml', '.phtm',
>         '.phtml', '.cgi', '.php', '.php2', 'php3', '.php4', '.pl']
>    ext = os.path.splitext(filename)[1]
>    if ext in extensions:
It would be even better to:
     if ext.lower() in extensions:

>       ...
> 
> which has the arguable advantage of matching what your description says 
> instead of what your original code does.
> 
> regexes are wonderful: in moderation.

I hate them! :/

> 


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