On 28Oct2014 04:02, massi_...@msn.com <massi_...@msn.com> wrote:
I'm not really sure if this is the right place to ask about regular
expressions, but since I'm usin python I thought I could give a try :-)
Here is the problem, I'm trying to write a regex in order to substitute all the
occurences in the form $"somechars" with another string. This is what I wrote:
newstring = re.sub(ur"""(?u)(\$\"[\s\w]+\")""", subst, oldstring)
This works pretty well, but it has a problem, I would need it also to handle the case in which
the internal string contains the double quotes, but only if preceeded by a backslash, that is
something like $"somechars_with\\"doublequotes".
Can anyone help me to correct it?
People seem to be making this harder than it should be.
I'd just be fixing up your definition of what's inside the quotes. There seem
to be 3 kinds of things:
- not a double quote or backslash
- a backslash followed by a double quote
- a backslash followed by not a double quote
Kind 3 is a policy call - take the following character or not? I would go with
treating it like kind 2 myself.
So you have:
1 [^\\"]
2 \\"
3 \\[^"]
and fold 2 and 3 into:
2+3 \\.
So your regexp inner becomes:
([^\\"]|\\.)*
and the whole thing becomes:
\$"(([^\\"]|\\.)*)"
and as a raw string:
ur'\$"(([^\\"]|\\.)*)"'
choosing single quotes to be more readable given the double quotes in the
regexp.
Cheers,
Cameron Simpson <c...@zip.com.au>
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