Pb encode

 Hi,

When I use this sql :

Code :
SELECT REGEXP_REPLACE('5 à7', '[[:alpha:]FROM dual

I get this error
ORA-00907: parenthèse de droite absente

When I use this sql :

Code :
SELECT REGEXP_REPLACE('5 éà7', '[[:alpha:]FROM dual

I get this character:  5 ¿

I would like to have 57 ...

what's the solution ?

with a database with this enode : FRENCH_FRANCE.WE8MSWIN1252, I don't have the problème

Thanks for your help.