string="something <a a> somethig <a a> something"

now i want to change /<a.*a>/ to "tag"
i want result like this

string="something tag somethig tag something"

but when i try

string =~ /<a.*a>/            # here $& --->"<a a> somethig <a a>"
$`+'tag'+$'                   # 'something tag something'

how can i change each tag ?

any idea ?
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