Loading snort alerts into logstash (GROK PATTERN)

hi I am new to the elk stack and im trying to load snort event log into logstash for analysis but i cant seem to figure out the grok pattern. This is a sample data of how the snort alert log looks like, can someone help me out with the script n grok pattern to load this data into logstash

[**] [129:12:1] Consecutive TCP small segments exceeding threshold [**]
[Classification: Potentially Bad Traffic] [Priority: 2] 
07/11-14:18:47.086495 ->
TCP TTL:64 TOS:0x0 ID:6180 IpLen:20 DgmLen:168 DF
***AP*** Seq: 0x4573C100  Ack: 0x3A0B3D67  Win: 0x5AC  TcpLen: 20

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