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# RGSetOptionsPrefix

Sets the prefix used for searching for all `RG` options in the database.

## Synopsis

    #include "slepcrg.h"
    PetscErrorCode RGSetOptionsPrefix(RG rg,const char prefix[])

Logically Collective

## Input Parameters

- rg - the region context

- prefix - the prefix string to prepend to all `RG` option requests

## Notes

A hyphen (-) must NOT be given at the beginning of the prefix name. The first character of all runtime options is AUTOMATICALLY the hyphen.

## See Also

RG: Region, `RGAppendOptionsPrefix()`

## Level

advanced

## Location

src/sys/classes/rg/interface/rgbasic.c

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