Источник:
http://www.axaptapedia.com/SubStr
==============
Summary: /* SubStr */
== SubStr ==
'''Syntax'''
str SubStr (str _text, int _position, int _chars)
'''Description'''
Returns part of a string _text, starting at _position, for _chars characters.
'''Example'''
SubStr("Sample",4,3); // Returns "ple"
'''Notes'''
No exceptions are thrown for _position being out of bounds or for _chars being out of bounds. Consider the following:
SubStr("Sample",20,3); // Returns ""
SubStr("Sample",4,50); // Returns "ple"
Источник:
http://www.axaptapedia.com/SubStr