varnishlog:tldr:3cd7c

The command varnishlog -q 'ReqURL ~ "${regex}"' is used to run the varnishlog utility with a filtering option based on a regular expression.

Here's a breakdown of the command:

• varnishlog: This is the main command that is executed to start the varnishlog utility. It is used to monitor and display the Varnish cache HTTP traffic and related events.

• -q 'ReqURL ~ "${regex}"': -q is an option that allows you to provide a query/filter expression to varnishlog. In this case, the filter expression is 'ReqURL ~ "${regex}"'.

  • 'ReqURL' is a field used in the log to represent the request URL. It tracks the URL that the client is requesting from the server.

  • ~ is a comparison operator that checks if the value of ReqURL matches the regular expression ${regex}.

  • "${regex}" is a placeholder that represents the regular expression pattern. You need to replace it with a specific regular expression that you want to match against the request URLs.

Overall, this command will run varnishlog and display the log entries where the request URLs match the provided regular expression.