Description:
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---
From manual page: http://www.php.net/function.mb-ereg-search-pos#refsect1-
function.mb-ereg-search-pos-returnvalues
---
"Return Values

An array including the position of a matched part for a multibyte regular 
expression. The first element of the array will be the beginning of matched 
part, the second element will be length (bytes) of matched part. It returns 
FALSE on error."

While it is clearly specified that the length is returned in bytes, it is not 
clear at all whether the beginning index is returned in bytes or characters, and 
it is of critical importance in multibyte strings. Common sense would suggest 
it's characters, but then one would also expect the length to be return in 
characters while it is return in bytes, so it's hard to guess. And even if it 
was easy to guess, one should _never_ be expected to guess. That's what 
documentation is for.