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: 2011-03-17 14:25:16

Thak you Julian,

2011/3/17 Julian Gonggrijp <j.gonggrijp_at_[hidden]>

> Olivier Tournaire wrote:
>
> > I am not really familiar with regexp, an I am facing a
> > problem. I have some strings containing unicode sequences
> > (like "\u****"), and I would like to replace them with html
> > sequences (such that "\u****" becomes "&#x****;"). I think I
> > can do that with boost regexp, but I really do not know how.
> > The major problem is that I do not now in advance what are
> > the characters for "****". I however know that they are
> > always 4 and alphanumeric. So, I have to detect them and
> > also append after a ";".
>
> I have no experience with Boost.Regex, but these are the
> notations you need.
>
> 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})"

Best regards,

Olivier

>
> Replacement pattern: "\&#\1;"
>
> Here, "\1" stands for "the match to the first pattern in
> parentheses", so that's your four digits. You'll have to
> refer to the Boost.Regex manual to find out how to apply
> these patterns.
>
> HTH, Julian
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