Re: [Boost-users] [regexp] Replace a substring with a regexp

Subject: Re: [Boost-users] [regexp] Replace a substring with a regexp
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2011-03-18 05:36:17

2011/3/18 Julian Gonggrijp <j.gonggrijp_at_[hidden]>

> Olivier Tournaire wrote:
>
> 2011/3/17 Julian Gonggrijp <j.gonggrijp_at_[hidden]>
>
>>
>> Search pattern: "\\u(\w{4})"
>>
>
> It seems that we also have to escape the "\" in "\u". The working regex
> seems to be:
>
> "\\\\u(\w{4})"
>
>
> I'm surprised. The first backslash was already there to escape the
> second. Are there maybe two steps of backslash interpretation at work,
> one by the C++ compiler and one by Boost.Regex?
>

I forgive to say that I finally used Qt (since I already used it in my
project) which has a convenient QString::replace method which handles regex.

> In any case, I forgot
> to escape the backslash in "\w", you'd probably have to give that one
> the same treatment. And also the ones in "\&" and "\1" in the
> replacement pattern.
>

Yes, you are right, I should have also mentionned them.

>
> But if you get the right result as the patterns stand right now,
> that's of course also fine. :)
>

Thank you for pointing me in the right direction!

Regards,

Olivier

>
> -Julian
>
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