function isTashkeelArabicChar(char) {
    return /[\u0600-\u0605\u060C-\u060E\u0610-\u061B\u061E\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7\u06E8\u06EA-\u06ED]/.test(char);
}
Handle a single substitution - format 1
@param {ContextParams} contextParams context params to lookup