HexToByte 16进制字符串转 []byte Like pack("H*", string) in PHP.

IsEmpty 判断字符串是否为空.

Len 获取字符串长度（一个中文算 1）.

LowerFirst 首字母小写.

RemoveEmoji 清理 Emoji 表情.

RemoveExtraSpace 移除多余的空格.

SequentialWordFields 将 s 字符串根据指定的分隔符分隔为 1 - n 个连续单词组合的词组 单词前后的非字母和数字将会移除掉（比如 help? 将会变成 help），单词中间的则不会处理（a?b 包含在单词中间的 ? 不会处理） stringx.SequentialWordFields("this is a string, are you sure?", 1, ",") => ["this", "is", "a", "string", "are", "you", "sure"] stringx.SequentialWordFields("this is a string, are you sure?", 2, ",") => ["this", "is", "a", "string", "are", "you", "sure", "this is", "is a", "a string", "are you", "you sure"].

Split split word by special seps, use empty string if seps is empty.

ToNarrow Full width string to half width.

ToNumber 字符串转换为唯一数字 https://stackoverflow.com/questions/5459436/how-can-i-generate-a-unique-int-from-a-unique-string.

ToWiden Half with string to full width.

TrimAny 移除头部和尾部指定的内容.

UpperFirst 首字母大写.

WordMatched 判断 s 中是否包含指定的 words 单词 对于英文必须是单词形式，比如 he 不能匹配 hello world，只能匹配 hello|world 如果是中文的话，则会使用 Index 进行判断，不等于 -1 则判断为匹配.