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In my mail.log I see frequent errors like this:

Dec  2 18:07:45 ip-172-26-5-36 postfix/smtpd[32302]: warning: ip112.ip-149-56-254.net[149.56.254.112]: SASL LOGIN authentication failed: Invalid authentication mechanism

to catch these users I have created this regex:

failregex = ^%(__prefix_line)swarning: [^\[]\[<HOST>\]: SASL ((?i)LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed(: [ A-Za-z0-9+/:]*={0,2})?\s*$

But it's not matching. Can someone explain what's wrong?

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