question: public static int findNonNestedChar ( final String haystack , final String needles ) { int openBrackets = 0 ; for ( int i = 0 ; i < haystack . length ( ) ; i ++ ) { if ( haystack . charAt ( i ) == '(' || haystack . charAt ( i ) == '[' || haystack . charAt ( i ) == '{' ) { openBrackets ++ ; } else if ( haystack . charAt ( i ) == ')' || haystack . charAt ( i ) == ']' || haystack . charAt ( i ) == '}' ) { openBrackets -- ; } else if ( openBrackets == 0 ) { for ( int j = 0 ; j < needles . length ( ) ; j ++ ) { if ( haystack . charAt ( i ) == needles . charAt ( j ) ) { return i ; } } } } return - 1 ; }
target:  Finds the first index of a needle character in the haystack, that is not nested in brackets.