Dear Ram, Thank you very much for your kind assistance but this works only if the words in the file is separated with a defined spacer such as a white space, what if the file contains only strings without any spacer (junk of characters or sequence of characters to be precise). That's where I am stuck. I need to find the number of occurrence of all possible substrings, that to in linear time (sry, that I was not clear). example: $text = 'howdoidoit' and the answer should be like, for substring of length 3 => how = 1 ; owd = 1 ; wdo = 1 ; doi = 2 ; oid = 1 ; ido = 1 ; oit = 1 ;

In reply to Re^4: Exact string matching by Anonymous Monk
in thread Exact string matching by Anonymous Monk

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