src/aria/utils/String.js
function (str, index) {
            var res = false;
            for (var i = index - 1; i >= 0; i--) {
                if (str.charAt(i) == "\\") {
                    res = !res;
                } else {
                    return res;
                }
            }
            return res;
        }
function (str, index) {
            var res = false;
            for (var i = index - 1; i >= 0; i--) {
                if (str.charAt(i) == "\\") {
                    res = !res;
                } else {
                    return res;
                }
            }
            return res;
        }
function ( str , index ) { var res = false ; for ( var i = index - 1 ; i >= 0 ; i -- ) { if ( str . charAt ( i ) == "\\" ) { res = ! res ; } else { return res ; } } return res ; }
Return true if the character at index in str is escaped with backslashes.
@param {String} str
@param {Integer} index
@return {Boolean} true if the character is escaped, false otherwise
Return true if the character at index in str is escaped with backslashes .