1, FIND function - the character in the string you want to find the location
The FIND (find_text, within_text, start_num)
Find_text is the string you want to find.
Within_text To find the cell that contains the keyword. That is to find keywords within this cell
Start_num specified number of characters to start looking.
If within_text no find_text, FIND returns the error value # of VALUE !.
FIND function is case-sensitive
2, Search function
formula search function
= search (find_text, within_text, start_num)
= search (the character you want to find, text characters where to begin searching from the first few characters)
The third parameter can be omitted (default first start looking from) .
Search functions are not case sensitive.
3, TRIM function and the CLEAN function
trim function and clean function
Trim () function: remove leading and trailing spaces, intermediate spaces will be reserved a space
Clean () function: delete the character which contains the current operating system can not be printed.
4, LEFT and RIGHT function
Intercept function
left函数公式：
LEFT(text, num_chars)
其中text表示我们要截取的那个内容num_chars表示截取的字符的数量
right函数语法：
right(text,num_chars)
其中text表示要截取的字符串
num_chars表示截取的字符的数量
5、MID函数
MID字符串函数，作用是从一个字符串中截取出指定数量的字符
MID函数公式：
MID(text, start_num, num_chars)
text被截取的字符
start_num从左起第几位开始截取（用数字表达）
num_chars从左起向右截取的长度是多少（用数字表达）
Len函数公式：
Len(string | varname)
LEN函数是一种函数，功能是返回文本串的字符数。