[Bug 264343] mail/squirrelmail: Fix spell checker not working

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264343

--- Comment #3 from Zsolt Udvari <uzsolt@uzsolt.hu> ---
Hm, I can see the problem: the ereg is deprecated and removed from PHP7+ and
should use preg_match instead.
But there are one problem (at least): these functions return values differ,
ereg: 
"Returns the length of the matched string if a match for pattern was found in
string, or FALSE if no matches were found or an error occurred.

If the optional parameter regs was not passed or the length of the matched
string is 0, this function returns 1."

preg_match:
"preg_match() returns 1 if the pattern matches given subject, 0 if it does not,
or false on failure. "

We should check every calls of ereg and check the parameters and the handle of
return value - and change it if needed.

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