Mid
Extracts a fixed-length text from a specific position within content.
【string】is the content you input, which contains the text to be extracted. The content can be input text or referenced field data.
【whereToSearch】is the position you specify to extract the text from, using a number to indicate the character position. For example, the number "3" means to extract from the 3rd character of the content.
【count】is the length of the text to extract, using a number to indicate. For example, the number "2" means to extract 2 characters from the specified position.