Author: a.koethur

Description:
When a page contains an external Link which is surrounded by unicode quotation marks (U+201E double low-9 quotation mark and U+201C left double quotation mark), then the article's entry in the searchindex table (field si_text) will be an empty string.

Reproduce: Just add the following text to an article and save/update fulltext index:

„http://example.com“

I've done some investigation.
I found out that the first problem arises in includes/search/SearchUpdate.php starting at line 64 where external URLs should be stripped. preg_replace destroys the trailing quotation mark and leaves illegal unicode sequence in $text. At some later stage in processing $text gets truncated to an empty string, presumably because of the illegal unicode sequence.

Version: 1.18.x
Severity: major