The wordfinder puzzle is already gone! I played a bit with a (possibly) faster string searcher. Back in the 80s I remember a lot of excitement about the Boyer-Moore search algorithm. It can be much faster than checking each position for a match, and gets even faster on longer search strings. Here's a description on Moore's Best Ideas page.
Rather than implement Boyer-Moore (which is awfully complicated) I took the first half of the algorithm from memory and made this.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi