Regex substitution: Replace texts, not codes

Question

I'm trying to solve a quiz of regex for days but still can't get it right. I'm getting so close but still can't get it to pass.

Task:

In an HTML page, replace the text micro with µ. Oh, and don't screw up the code: don't replace inside <the tags> or &entities;

Replace

• micro -> µ
• abc micro -> abc µ
• micromicro -> µµ
• µmicro -> µµ

Don't touch

• <tag micro /> -> <tag micro />
• µ -> µ
• &abcmicro123; -> &abcmicro123;

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I tried this but it fails on the last µ, what did I miss? Can someone point out what did I miss? Thanks in advance!

What I have tried:

Regex

((?:\G|\n)(?:.*?&.*?micro.*?;[\s\S]*?|.*?<.*?micro.*?>[\s\S]*?|.)*?)micro

Substitution

$1µ

Answer 1

You can try something like this:

(?:<.*?>|&\w++;)(*SKIP)(*F)|micro

replacement string:

µ