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This seems to work as expected for me:

[ATTACH=full]109594[/ATTACH]

[ATTACH=full]109595[/ATTACH]

Each spam phrase that isn't already a regex is normalised into one, e.g. the regex that runs on that example above is:

[code]

#(?<=\W|^)(微信)(?=\W|$)#iu[/code]

Note the unicode modifer at the end.

Are you certain, in your testing, it was with a user who will have their messages checked for spam? e.g. moderator/admin users and users who have exceeded certain criteria will not have their messages checked for spam.