Editing Search engine (computing) (section)

===String Search Engines===
In 1987, an article was published detailing the development of a character string search engine (SSE) for rapid text retrieval on a double-metal 1.6-μm n-well CMOS solid-state circuit with 217,600 transistors lain out on a 8.62x12.76-mm die area. The SSE accommodated a novel string-search architecture which combines a 512-stage finite-state automaton (FSA) logic with a content addressable memory (CAM) to achieve an approximate string comparison of 80 million strings per second. The CAM cell consisted of four conventional static RAM (SRAM) cells and a read/write circuit. Concurrent comparison of 64 stored strings with variable length was achieved in 50 ns for an input text stream of 10 million characters/s, permitting performance despite the presence of single character errors in the form of character codes. Furthermore, the chip allowed nonanchor string search and variable-length `don't care' (VLDC) string search.<ref>{{cite journal|last=Yamada|first=H.|author2=Hirata, M. |author3=Nagai, H. |author4= Takahashi, K. |title=A high-speed string-search engine|journal=IEEE Journal of Solid-State Circuits|date=Oct 1987|volume=22|issue=5|pages=829–834|doi=10.1109/JSSC.1987.1052819|bibcode=1987IJSSC..22..829Y|publisher=IEEE}}</ref>
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