Context

The support of custom grok patterns was added in #15

Just add the directory with name Patterns and a file (the file name doesn't matter) with your own patterns.

Like Patterns\grok-custom-patterns:

ZIPCODE [1-9]{1}[0-9]{2}\s{0,1}[0-9]{3}

and use:

Grok grok = new Grok("%{ZIPCODE:zipcode}:%{EMAILADDRESS:email}");
var grokResult = grok.Parse($"122001:Bob.Davis@microsoft.com");

IndexOutOfRangeException

There is an issue when that custom file has the wrong content.

How to reproduce

Add to the Patterns\grok-custom-patterns the following data:

pattern

How to fix

Add some validation on load of custom grok file content. It should be pattern name, space, then the regexp for that pattern