Awk error message targeting a parentheses -

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i'm running awk command cant find why keeps on telling me wrong, variables instantiated (i have replaced them string here show error, error same), braces closed, advice?

 key=$(echo "hello,there" | awk -f"," -v index=2 '{for(i=1; i<=nf; i++) if ($i ~ $index) print i}')

i'm not perfect awk user, cant spot issue here advice?

index built-in function (keyword) cannot use variable name. change to:

awk -f"," -v idx=2 '{for(i=1; i<=nf; i++) if ($i ~ idx) print i}')

the field specifier, $, prefixing idx not correct, want use string is.


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