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query with regular expression

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All,

I am writing a query to select * from where ~ '[regx]  an example of the sting that I am matching is below

FHLG16725

The first two alpha characters to match are FN, FH, GN any alpha characters between those and the numeric don't matter as the first two alpha + numeric will create a unique.

reading the docs I am pretty sure I need to use ~ for bracket _expression_ 

I tried '^[FN-FG-GN][0-9]' but does not seem to work.  I have to admit I am weak on regex - never quite seem to be able to get it through my coconut.

Any help would be appreciated,
Glenn

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