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Can anyone point to best algorithm for substring search in another string? or search for a char array in another char array?

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The best from what point of view? Knuth-Morris-Pratt is a good one. You can find more of them discussed on the Wikipedia entry for string searching algorithms.

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It depends on what types of searching you are doing. Specific substring over a specific string? Specific substring over many different strings? Many different substrings over a specific string?

Here's a popular algorithm for a specific substring over many different strings.

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Boyer-Moore algorithm: http://en.wikipedia.org/wiki/Boyer–Moore_string_search_algorithm

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This strstr() implementation seems pretty slick.

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It is strstr.c for alpha. Which algorithm it uses? Which algorithm is used in x86 (or _64) for strstr?

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