Entrypoint digits compatible with UTF-8
Input CSTRING(32760) String from which all non-numbers had to be removed Output CSTRING(32760) String with removed all non-numbers (e.g. for TAPI)
TestSQL SELECT '0232653535' AS ISCORRECT, F_DIGITS(' (0232) / 6535-35') FROM RDB$DATABASE; SELECT NULL AS ISCORRECT, F_DIGITS(NULL) FROM RDB$DATABASE;