目录核心截取函数1.SUBSTRING()/SUBSTR()2.LEFT()&RIGHT()3.SUBSTRING_INDEX()八大关键注意事项1.索引从1开始（不是0）2.多字节字符问题（中文/emoji）3.长度超限自动修正4.NULL处理规则5.负起始位置计算6.性能陷
I\'ve been tasked to work on a project that has some confusing attributes. The project is of the nature that it won\'t compile for the iPhone Simulator And the iPhone Device with the same compile set
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