regex - SQL/Oracle: INSTR or REGEXP? -

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i'm studying exam , don't one:

i want find cities in table ends ville, in charlottesville.

which 1 correct? 

... instr(city,'ville') > 0;   or   ... regexp_substr(b,'ville$') = 'ville'

which of these 2 it? , wrong other one?

regards jop


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