Interesting, but it depends of new line. In my example each tag separated by new line, but it is special case.
And it seems your regexp could be more efficient: 
s(
     (?: (?: \G (?<! \A) | \A {name_a) $not_sp_param*+ \K)
     \s+ \w+ = \" [^^\"]* \"
)
()xmsg;

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In reply to Re^2: RegExp: pos management in global substitution by OlegG
in thread RegExp: pos management in global substitution by OlegG

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