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Message: [QUOTE="Ben Bacarisse, post: 4066950"] First off, it's not an invariant. I think a confusion between loop conditions and loop invariants has crept into another thread and you maybe picked up the term from there. Anyway, I assume you mean the loop condition. It is indeed not correct. For one thing it looks like you want to stop the loop when you see a null pointer, but your arrays don't end with one. You should write: char *exceptions[] = { "exception1", "exception2", "exception3", NULL }; The pointers in the array are simply exceptions[0], exceptions[1] .. exceptions[3] No need for ** or adding to a pointer (yes, X[I] means *(X+I) but the [] notation is there to be used). I presume the puts is from some testing you were doing. The match_any function would return true (1) as soon as buff is seen to contain exceptions[i] as a substring (using strstr). It would return false (0) if the loop ends without have seen any such match. You're welcome.[/i][/I] [/QUOTE]