#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?m)^.*\bRSA SHA256:.*(?:\n.*){3}"
Local $sString = "Oct 21 17:27:21 localhost sshd[19772]: Accepted publickey for vagrant from 192.168.2.140 port 54614 ssh2: RSA SHA256:uDsE4ecSD9ElWQ5Q0fdMsbqEzOe0Hszilv8xhU6dT6M" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19772]: pam_unix(sshd:session): session opened for user vagrant by (uid=0)" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19772]: User child is on pid 19774" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19774]: Starting session: shell on pts/2 for vagrant from 192.168.2.140 port 54614 id 0" & @CRLF & _
"" & @CRLF & _
"Oct 21 17:27:21 localhost sshd[19772]: Accepted publickey for vagrant from 192.168.2.140 port 54614 ssh2: RSA SHA256:uDsE4ecSD9ElWQ5Q0fdMsbqEzOe0Hszilv8xhU6dT6M" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19772]: pam_unix(sshd:session): session opened for user vagrant by (uid=0)" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19772]: User child is on pid 19774" & @CRLF & _
"Oct 21 17:27:22 localhost sshd[19774]: Starting session: shell on pts/2 for vagrant from 192.168.2.140 port 54614 id 0" & @CRLF & _
"" & @CRLF & _
""
Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH)
Local $aFullArray[0]
For $i = 0 To UBound($aArray) -1
_ArrayConcatenate($aFullArray, $aArray[$i])
Next
$aArray = $aFullArray
; Present the entire match result
_ArrayDisplay($aArray, "Result")
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm