Autor: Giuseppe D'Angelo Fecha: A: Zoltán Herczeg Cc: pcre-dev Asunto: Re: [pcre-dev] A clarification upon PCRE_NO_UTF(8|16)_CHECK
2012/4/7 Zoltán Herczeg <hzmester@???>: >
> So your guess is right: if the subject string does not change, PCRE_NO_UTF8_CHECK can be passed to subsequent calls (regardless if the pattern changes, or it does not match or anything).
Ok, great!
> Moreover, if QString guarantees that it always contains a valid UTF16 string, you can pass PCRE_NO_UTF8_CHECK all the time (just check that the starting offset also points to a beginning of a valid UTF16 character. This is easy, just check that the memory location does not point to a second part of a surrogate).
Unfortunately that's not the case: from this point of view, QString is
a "mere" container of UTF16 code units. One has access to the
underlying data and can easily build an illegal UTF16 sequence. :-(
> Btw, I heard that Qt5 alpha is released and contains a PCRE based QRegularExpression. Really nice job!
Thank you very much! Another one for the list on the homepage ;-)
