Why would I pronounce it? It's not even a real operator, and hence I wouldn't write it as such in serious code.

$count = () = /foo/g;
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is just "assign the number of occurrences of foo to count". Or would you say:

scalar-sigil identifier-count scalar-assign empty-list list-assign match-open regexp-literal-foo match-close modifier-g semi-colon

possibly replacing scalar-assign empty-list list-assign with goatse or another name?