VDS Renaissance 的界面提供多种语言。官方文档以英语维护，以确保提供统一、一致且始终最新的参考。
@SUBSTR
Windows ✓Linux ✓macOS ⏳
Syntax
@SUBSTR(<string>,<pos1>,<pos2>)Description
This function returns the substring of <string> starting at character position <pos1> and ending at character position <pos2>. The characters in the string are counted from 1.
If <pos1> is omitted or zero then the function returns <string> unmodified. If< pos2> is zero or omitted, just the single character at <pos1> is returned. If <pos2> is negative, the ending position is counted from the end of the string.
OK
Unchanged.
Example
%S = @substr(%A,4,8)info Substring of %A from 4 to 8 is: %S