Just a heads-up for those that what to upgrade to PHP 7.3: it seems
like there are some incompatibilities with Horde (master) in handling
regular expressions.
Some (but not all) messages will not display content. The following is
logged for each message:
2018-12-25T12:47:27+01:00 WARN: horde [imp] PHP ERROR: preg_replace_callback(
): Compilation failed: invalid range in character class at offset 68 [pid 207
6 on line 99 of "/usr/share/php7/PEAR/Horde/Text/Filter.php"]
2018-12-25T12:47:27+01:00 WARN: horde [imp] PHP ERROR: preg_replace_callback(
): Compilation failed: invalid range in character class at offset 649 [pid 20
76 on line 99 of "/usr/share/php7/PEAR/Horde/Text/Filter.php"]
This may be due to the stricter interpretation of character ranges in classes.
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