Javascript: How can I replace the contents of a string but not in an HTML tag? -

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i want write javascript function change text lasvegas in string: example:

"hello every 1 in lasvegas, come <a href='xxx'>lasvegas</a> me"

how can change text "lasvegas" not change content lasvegas in html tag?

may that

str.replace(/lasvegas[^<]/,'123')

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