Syntax highlight problems

Hi everyone.

I think I'm a little bit rusty using regular expressions in syntax highlight.
I was trying to add a custom highlight to a Doxygen comment body and, for some
reason, it is leaking to outside the comment limits.

In the file 'after/syntax/doxygen.vim' I did the following:

syn match doxygenCustomUnderline contained /[^}]*/
    \ containedin=doxygenUnderlineMatch
syn region doxygenUnderlineMatch transparent contained
    \ start=/\%(\%(\\\|@\)uf\){/ms=s+4 end=/}/ keepend
    \ contains=doxygenCustomUnderline containedin=doxygenBody,doxygenBrief

hi def link doxygenCustomUnderline Underlined

NOTE: In the original file there are no continuation lines. Each group is
wrote in a single line. I use continuation line here to ease reading.

The I made the test in a 'syntest.cpp' file:

/**
 * Brief description \uf{underlined}.
 * With body @uf{underlined too}.
 */
int main(int argc, char** argv) { }
        --------------------------

Surprisingly the underlined text is marked with '--' in addition to both
regions in the doxygen comment. What could cause this kind of leak? I can't
understand since the group 'doxygenCustomUnderline' is specifically set as
contained in the group 'doxygenUnderlineMatch'.

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