Matching Algorithm In CurrentSnort?

[jiangzhw2008 <jiangzhw2008 () yeah net>]

Dear, all
can you help me answering the following questions:
1. which string matching algorithm currently used in current snort versions?
2. where I can find the code of these algorithms?
3. if I developed a new algorithm , can I replace the current one with my algorithm to check and compare both? what 
files I must change?

Best regards!
jiangzhw2008 () yeah net

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