oracle11g - Oracle regular expression using hyphen in pattern -

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why query returning value 4 (i expected 0)?

select  regexp_instr ('123abc','[a-z]') dual;

i think [] should indicate character list, , a-z includes upper letters?

this affected session's nls_sort setting, , result of 4 if have case-insensitive sorting enabled:

alter session set nls_sort=binary; select  regexp_instr ('123abc','[a-z]') dual;  regexp_instr('123abc','[a-z]') ------------------------------                              0  alter session set nls_sort=binary_ci; select  regexp_instr ('123abc','[a-z]') dual;  regexp_instr('123abc','[a-z]') ------------------------------                              4

you can read more in documentation; , may find this answer useful too.


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