Fixed bug #79188 #5126
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Fixed bug #79188 #5126
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Fix for https://bugs.php.net/bug.php?id=79188.
We distinguish the "last end offset" and the "start offset". These are only going to differ for the "empty match" special case, in which case "last end offset" will be one unicode offset before the "start offset".
Copying of that extra character will now fall to the general code for copying the string between the last end offset and the start of the current match, which will also manage the allocation size correctly.