public static boolean isBaseLetter(char ch) {
		Character.UnicodeBlock ub = Character.UnicodeBlock.of(ch);
		return ub == Character.UnicodeBlock.BASIC_LATIN || Character.isWhitespace(ch);
	}
char is base latin or whitespace?
@param ch a character
@return true or false
spring-cloud-alibaba-starters/spring-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/utils/NacosConfigUtils.java