Function exprSafeFieldName

packages/sanddance-specs/src/expr.ts:16–19

(field: string)

 * Make sure the field name is usable in a Vega expression
 */
export function exprSafeFieldName(field: string) {
    //remove whitespace, period, accessors and logical modifiers
    return field.replace(/[.,:;+=\-/<>{}|~!@#$%^*[\]`'"()?\s\\]/g, '');
}