oracle11g - instr() in oracle 11g - 


sql> select instr('stringrings','rin',-4,1) dual;  instr('stringrings','rin',-4,1) -------------------------------                               7

when provide search position -4 , searches backward right left, returns match position 7 though whole pattern not match given search starting position. here partial pattern matches in original string.

sql> select instr('stringrings','rin',-5,1) dual;  instr('stringrings','rin',-5,1) -------------------------------                               7

here same result...

sql> select instr('stringrings','rin',4,1) dual;  instr('stringrings','rin',4,1) ------------------------------                              7

but here, in positive direction search ignores partial pattern match , gives position exact pattern matches.. can explain me? why double standards?

no double standarts:

select instr('stringrings','rin',-4,1) dual;

instr start search stringrings (-4), searching backward until first rin = stringrings (7)

select instr('stringrings','rin',-5,1) dual;

instr start search stringrings (-5), searching backward until first rin = stringrings (7)

select instr('stringrings','rin',4,1) dual;

instr start search stringrings (4), searching foreward until first rin = stringrings (7)


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