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SQL> select regexp_instr('121212adfazxczxc111111sdfasdsadf','[^[:digit:]]') from dual;

REGEXP_INSTR('121212ADFAZXCZXC
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SQL> select regexp_instr('1111111111232323','[^[:digit:]]') from dual;

REGEXP_INSTR('1111111111232323
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SQL> select regexp_instr('aaaaa1111111111232323','[^[:digit:]]') from dual;

REGEXP_INSTR('AAAAA11111111112
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