Logstash - Framing grok filter plugin

Hi ,
I have a bunch of students records in my database(MySQL) and i want to pull those to elastic search which matches my pattern . Now i need to write a configuration file for this .I'm clear about writing input and output plugins.
But I don't have much idea in writing the grok filter plugin even though i visited the documentations.

my pattern : g^[a-zA-Z ] (Accepts names that starts with g)

field name in my table : Student_Name

Can any one help me to frame the filter plugin ??

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