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Regular Expression
r"
[Nn]issan(?=[^<>]*<)(?!(?:(?!</?(?:a|span)[ >/])(?:.|\n))*</(?:a|span)>)
"
g
Input 1
New
Nissan nissan <span>Nissan</span> <a href="nissan.com">Nissan</a> <a href="nissan.com"><span>Nissan</span></a> Company Nissan is a name. and Nissan Micra is model name. Company <a href="nissan.com"><span>Nissan</span></a> is a name. and Nissan Micra is model name. This is new <a href='https://www.url.com'><span>URL</span></a>.<br /> Company Nissan is a name. and Nissan Micra is model name. </p> <p>Company Nissan is a name Company Nissan is a name. Company Nissan is a name and <a href='www.nnm.be'><main>New Nissan Micra</main></a> is model name.</p> <a>nissan </a> <a>nissan </a> <a>nissan<span></span><a> <a foo="nissan" bar="<">text<a>
Substitution
Nissan nissan <span>Nissan</span> <a href="nissan.com">Nissan</a> <a href="nissan.com"><span>Nissan</span></a> Company Nissan is a name. and Nissan Micra is model name. Company <a href="nissan.com"><span>Nissan</span></a> is a name. and Nissan Micra is model name. This is new <a href='https://www.url.com'><span>URL</span></a>.<br /> Company Nissan is a name. and Nissan Micra is model name. </p> <p>Company Nissan is a name Company Nissan is a name. Company Nissan is a name and <a href='www.nnm.be'><main>New Nissan Micra</main></a> is model name.</p> <a>nissan </a> <a>nissan </a> <a>nissan<span></span><a> <a foo="nissan" bar="<">text<a>