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regarding contains operator

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 i have a field whose type is varchar(16)
 
and the field is multivalued, in the sense it is of the form
 
abc\def\tez
(i.e. backslash separed values)
 
please tell me is there any operator available which enables me to do the following:
 
field contains <some value>
 
eg field contains "abc" should return true, similary for def or tez
 
if it is not ther can i write my own operators? abd use them please send me the link where i can find documnetation on the same
thanks,
regards
Surabhi Ahuja
 

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