Text contains search without database -

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i have 15 million datas. , each datas has name, title.
, datas in text file.

how can find datas contains text.

search text: hi
example data: 

peter|just text. brown|hi, nice meet john|hello, world! hi|hello hello|this not matched data. ...

result data: 

brown|hi, nice meet hi|hello ...

when searching. spends 7 seconds.
but, want faster database.
how can do?


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