in reply to Substrings of unusual size!
Primary question: do you have the rules that determine how each 'G' record is composed?
Secondary question: Is the 'G' record in the same file as the 'E' records?
If the answer to both of those questions, or even just the primary question, is "yes" then this becomes relatively simple with split. I recall you asking about working with the source files in an earlier question, so I presume you figured a bit of this out already. The same thing applies here. Make a hash that defines what field from a given type of 'E' record is used in constructing the 'G' record and the approach you are going is quite workable.
On time, cheap, compliant with final specs. Pick two.
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