Handle PIDs in messages and message prefixes #3
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Field 1 on the default HAProxy log format is set as `process_name '[' pid ']:'` which is also displayed in the example message in README. The existing rules do not allow for the PID brackets. This commit properly resolves them while also maintaining backwards compatibility for a PID-less log format.
In case there is a prefix applied to the message, the `^haproxy` condition match would fail. There are already some of the extractors which have dropped the line-start requirement from their regular expressions. This commit removes the requirement from all the extractors for consistency and input flexibility.
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The provided example includes a message using the default log format. This includes a PID next to the process name such as
haproxy[1234]:which does not currently get properly parsed. Additionally, some extractors already work for messages with prefixes (such as datetime being added there) while others do not, therefore this PR adds consistency by dropping the^line-start requirement.