|   | 
Returns a string constructed from a sub string of argument 1. First character is at index specified by argument 2 while argument 3 is the length of the result. The first character is at index 0.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | string | Yes | 
 | String | 
| 2 | real | Yes | 
 | Start index | 
| 3 | real | No | to end of string | Length of result | 
Return type: string
| Mid('Hello World!', 6, 5) | 
| 
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