Steven D'Aprano wrote:
> On Fri, 21 Dec 2007 00:00:47 +0000, lex __ wrote:
>
>> I'm tryin to use regexp to replace multi-line c-style comments (like /*
>> this /n */ ) with /n (newlines). I tried someting like
>> re.sub('/\*(.*)/\*' , '/n' , file) but it doesn't work for multiple
>> lines.
> Regexes won't cross line boundaries unless you make them multiline with
> re.MULTILINE.
re.MULTILINE affects the behaviour of ^ and $, the relevant flag is re.DOTALL:
> Also, I'm no expert on regexes, but it looks to me that your regex is
> greedy. I think you need the non-greedy version, which by memory (and
>>> re.compile("/\*(.*?)\*/", re.DOTALL).findall("/*a*/ /*b\nb*/ /*c/*c*/")
['a', 'b\nb', 'c/*c']
>>> def replace(match):
... return "\n" * match.group(1).count("\n")
...
>>> re.compile(r"(/\*.*?\*/)", re.DOTALL).sub(replace, "A /*a*/ BB /*b\nb*/ CCC
>>> /*c/*c*/")
'A BB \n CCC '
> Have you considered what happens when your C code includes a string
> literal containing '/*'?
Indeed.
Peter
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