Regular Expressions 101

Explanation
Pro

1st Alternative(?i)<\/?\w+[^>]*>(*SKIP)(?!)

(?i)applies the following effective flags to the remainder of the pattern: gui

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

\w+a Unicode word character, repeated at least once

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

Negative Lookahead(?!) — always fails to match

2nd Alternative\b(\p{Latin})\s

\ba Unicode word boundary

Group 1(\p{Latin})

\p{Latin}characters whose Script property is Latin

\sa Unicode whitespace character

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

u modifier: unicode. Treats the pattern and subject as UTF-16

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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25 tokens

(?i)<\/?\w+[^>]*>(*SKIP)(?!)|\b(\p{Latin})\s

There are no unit tests.