James Stroud wrote:
> John Pye wrote:
>> Hi all
>>
>> I have a file with a bunch of perl regular expressions like so:
>>
>> /(^|[\s\(])\*([^ ].*?[^ ])\*([\s\)\.\,\:\;\!\?]|$)/$1'''$2'''$3/ #
>> bold
>> /(^|[\s\(])\_\_([^ ].*?[^ ])\_\_([\s\)\.\,\:\;\!\?]|$)/$1''<b>$2<\/
>> b>''$3/ # italic bold
>> /(^|[\s\(])\_([^ ].*?[^ ])\_([\s\)\.\,\:\;\!\?]|$)/$1''$2''$3/ #
>> italic
>>
>> These are all find/replace expressions delimited as '/search/replace/
>> # comment' where 'search' is the regular expression we're searching
>> for and 'replace' is the replacement expression.
>>
>> Is there an easy and general way that I can split these perl-style
>> find-and-replace expressions into something I can use with Python, eg
>> re.sub('search','replace',str) ?
>>
>> I though generally it would be good enough to split on '/' but as you
>> see the <\/b> messes that up. I really don't want to learn perl
>> here :-)
>>
>> Cheers
>> JP
>>
>
> This could be more general, in principal a perl regex could end with a
> "\", e.g. "\\/", but I'm guessing that won't happen here.
>
> py> for p in perlish:
> ... print p
> ...
> /(^|[\s\(])\*([^ ].*?[^ ])\*([\s\)\.\,\:\;\!\?]|$)/$1'''$2'''$3/
> /(^|[\s\(])\_\_([^ ].*?[^ ])\_\_([\s\)\.\,\:\;\!\?]|$)/$1''<b>$2<\/b>''$3/
> /(^|[\s\(])\_([^ ].*?[^ ])\_([\s\)\.\,\:\;\!\?]|$)/$1''$2''$3/
> py> import re
> py> splitter = re.compile(r'[^\\]/')
> py> for p in perlish:
> ... print splitter.split(p)
> ...
> ['/(^|[\\s\\(])\\*([^ ].*?[^ ])\\*([\\s\\)\\.\\,\\:\\;\\!\\?]|$',
> "$1'''$2'''$", '']
> ['/(^|[\\s\\(])\\_\\_([^ ].*?[^ ])\\_\\_([\\s\\)\\.\\,\\:\\;\\!\\?]|$',
> "$1''<b>$2<\\/b>''$", '']
> ['/(^|[\\s\\(])\\_([^ ].*?[^ ])\\_([\\s\\)\\.\\,\\:\\;\\!\\?]|$',
> "$1''$2''$", '']
>
> (I'm hoping this doesn't wrap!)
>
> James
I realized that threw away the closing parentheses. This is the correct
version:
py> splitter = re.compile(r'(?<!\\)/')
py> for p in perlish:
... print splitter.split(p)
...
['', '(^|[\\s\\(])\\*([^ ].*?[^ ])\\*([\\s\\)\\.\\,\\:\\;\\!\\?]|$)',
"$1'''$2'''$3", '']
['', '(^|[\\s\\(])\\_\\_([^ ].*?[^
])\\_\\_([\\s\\)\\.\\,\\:\\;\\!\\?]|$)', "$1''<b>$2<\\/b>''$3", '']
['', '(^|[\\s\\(])\\_([^ ].*?[^ ])\\_([\\s\\)\\.\\,\\:\\;\\!\\?]|$)',
"$1''$2''$3", '']
James
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