PETSc version 3.17.0
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# PetscOptionsValidKey

PETSc Options database keys must begin with one or two dashes (-) followed by a letter.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode PetscOptionsValidKey(const char key[],PetscBool *valid)

Not collective

### Input Parameter

| key | - string to check if valid

### Output Parameter

| valid | - PETSC_TRUE if a valid key

### Level

intermediate

### Location

src/sys/objects/options.c
Index of all Sys routines
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