This usually occurs when I submit for "Preview". I click it a 2nd time and it updates view/post just fine.
phpBB: 3.1.10
Host: Blue Host
Errors: Always these 3 warnings.
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[phpBB Debug] PHP Warning: in file [ROOT]/includes/message_parser.php on line 84: preg_match(): Compilation failed: unrecognized character after (?< at offset 38
[phpBB Debug] PHP Warning: in file [ROOT]/includes/message_parser.php on line 84: preg_match(): Compilation failed: unrecognized character after (?< at offset 54
[phpBB Debug] PHP Warning: in file [ROOT]/includes/message_parser.php on line 84: preg_match(): Compilation failed: unrecognized character after (?< at offset 35
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I have reason to think this may be related to the Advance BBCode extension. I tried to go to phpBB 3.2.2 recently but had issues so went back to 3.1.10. When I did I had to go with the 3.1.12 version of BBCode rather than the version I had before for 3.1.10 or whatever compatible version that was.