regexp to replace double with single quotes inside html tags

[birgit kellner]

I would like to replace all double with single quotes inside a html tag, 
i.e. perform the substitution only for html tag attributes, but not outside 
tag boundaries.

my $string = qq|<a href="http://someurl.url"; title="welrkwlekrj">aha</a>, 
and here "follows" a
quoted expression: "blabla"<img src="http://someimage.gif"; width="80"
height="200">|;

All double quotes should be replaced by single ones except those 
surrounding the string "blabla".

My approach would be:
Look for <, followed by a string of characters except >, followed by" - if 
matched, replace this instance of " with '.

I found the following code to work, but it strikes me as very clumsy and I 
am not sure whether it captures all relevant cases and really excludes all 
those which are not relevant.

while ($string =~ /(<[^>]*?)"/gs) {
        my $var = $1;
        $string =~ s/$var"/$var'/;}
                
print qq|$string\n|;

The only case I found so far that it doesn't cover is when tag attributes 
themselves contain a ">"-character, like:
<img src="http://someimage.gif"; alt="8 > 4">

As always, suggestions and comments will be greatly appreciated,

Birgit Kellner

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