Substring a field from Logstash

I want create a new field based on an field from an JDBC input
i want to use the filter option of Logstash but not sure the how to.

My goal is to have something like this:

new_field = substr(old_field,1,300)
i want to extract the first 300 characters of the old field using for example the Grok filter...

How'd do that ?

I found the solution:

ruby {
code => "event['dest-field'] = event['src-field'][0..2]"

Credit to Magnus Bäck

In any version of logstash from recent years you will need to use event.get and event.set rather than refering to event as a hash.

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