Regular Expressions 101

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~
(?i)<\/?\w+[^>]*>(*SKIP)(?!)|\b(\p{Latin})\s
~
gui
1st Alternative
(?i)<\/?\w+[^>]*>(*SKIP)(?!)
(?i)
match the remainder of the pattern with the following effective flags: gui
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
< matches the character < with index 6010 (3C16 or 748) literally (case insensitive)
\/
matches the character / with index 4710 (2F16 or 578) literally (case insensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\w
match any word character in any script (equivalent to [\p{L}\p{N}_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character not present in the list below
[^>]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
> matches the character > with index 6210 (3E16 or 768) literally (case insensitive)
> matches the character > with index 6210 (3E16 or 768) literally (case insensitive)
(*SKIP) acts like (*PRUNE), except that if the pattern is unanchored, the bumpalong advance is not to the next character, but to the position in the subject where (*SKIP) was encountered
Negative Lookahead
(?!)
null, matches any position
2nd Alternative
\b(\p{Latin})\s
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
1st Capturing Group
(\p{Latin})
\p{Latin} matches any characters in the Latin script
\s matches any kind of invisible character (equivalent to [\p{Z}\h\v])
Global pattern flags
g modifier: global. All matches (don't return after first match)
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

~
~
gui

Test String

Substitution

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Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php