Tim Brosnan wrote:
> I initially send a version of this message through the google groups
> interface, but it seems to have disappeared. Apologies if there is
> duplication.
>
> When going through some regex examples from
> VimRegexTutor(https://github.com/dahu/VimRegexTutor) I found that one of
> the examples did not match the provided text when run in 7.4.383. Here
> is the regex and the sample text:
>
> *30* : Find Text between HTML tags >
>
> /\%(<\1>\)\@<=.*\%(<\/\(\w\+\)>\)\@=
>
> OR
>
> /\v%(\<\1\>)@<=.*%(\<\/(\w+)\>)@=
> <
> <level>Can I play, daddy?</level>
>
> Neither of the provided regexs would watch the sample text (it should
> match the text between html tags). However, when I tried 7.1.42 (only
> other version at hand) I found that the text between tags was matched
> correctly. Both versions were fun as -u NONE and "set nocompatible" to
> try to rule out option or plugin clashes.
>
> Is this is a bug or has regex behaviour changed between 7.1.42 and 7.4.383?
I don't think the pattern is supposed to work. The backreference is
before the capturing group. It's a suprise it works at all. Probably
because in the old regex engine the "\@<=" part is used only after
finding a match for the rest.
It's a very inefficient pattern too, better use:
/<\(\w\+\).\{-}>\zs.*\ze<\/\1>
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