Okay? So, we have your table, the original haystack and the needle you used:

00000110 needle offset 14
00001010 needle offset 0
00001101 needle offset 15
00010100 needle offset 1
00011010 needle offset 16
00101001 needle offset 2
00101010 needle offset 7
01000001 needle offset 12
01001010 needle offset 5
01010000 needle offset 10
01010010 needle offset 3
01010100 needle offset 8
10000011 needle offset 13
10010101 needle offset 6
10100000 needle offset 11
10100101 needle offset 4
10101000 needle offset 9

0000111010011100101110110111000111101011110011111011111110000000100010
+0100001010010101000001101000110010011000101101010110011011000000
000010100101010000011010

[download]

We've compared the needle at the first position of the haystack and it doesn't match. Now what?

  1. Which group of 8 bits from the haystack do we lookup in the table?
  2. And how do we translate the offset at which that pattern was found in the needle; into a number of bits to shift the needle?
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In reply to Re^4: Why Boyer-Moore, Horspool, alpha-skip et.al don't work for bit strings. (And is there an alternative that does?) by BrowserUk
in thread Why Boyer-Moore, Horspool, alpha-skip et.al don't work for bit strings. (And is there an alternative that does?) by BrowserUk

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