[Typo3] Warning: mb_ereg()

[Pierre Rouwens]

Hi list,

What's the matter ??
Warning: mb_ereg(): mbregex compile err: invalid regular expression; '{' 
can't be last character in 
/var/alternc/html/i/***/dev/typo3/mod/tools/em/index.php on line 2657

What typo3 wants me to do ? i've never seen this error before, i've 
search through the ML but find nothing but danish...too hard for me

Can anyone explains me what's wrong please ?

Thanks a lot in advance

Pierre Rouwens