Import Logs - Filename Pattern?

Import Logs - Filename Pattern?

Our WAF generates log files, with filenames which increment - rather than based on timestamp : e.g.

log_123
log_124
log_125
etc etc

I'd like to have these imported into ELA on a schedule. In the Import Log File screen, I can define a "Filename Pattern" - but all the options relate to the filenames based on timestamp.

How might I define the filename pattern for the pattern above?

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