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Ax51 User's Guide
Ax51 Introduction Assembling Programs Writing Assembly Programs Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting a Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes C Preprocessor Exceptions Side-Effects Predefined Macros Examples Error Messages AppendixSUBSTR Function
The SUBSTR MPL function returns a substring of the specified text argument. The SUBSTR function takes three arguments: a character string to be divided, and two numeric arguments. The syntax for the SUBSTR function is:
%SUBSTR (balanced-text,expression1,expression2)
Where
| balanced-text | is a text argument possibly containing macro calls. This is the string from which a substring is returned. |
| expression1 | specifies the substring's starting position in balanced-text. If expression1 is zero or is greater than the length of the balanced-text, SUBSTR returns a null string. The index of the first character of balanced-text is 1. |
| expression2 | specifies the number of the characters to expand from balanced-text. If expression2 is zero SUBSTR returns a null string. If expression2 is greater than the remaining length of the string all characters from the expression1th character to the end of the string are included. |
Source Text
%DEFINE (STRING) (abcdefgh) %SUBSTR (%string, 1, 2) %SUBSTR (%(1,2,3,4,5), 3, 20)
Output Text
ab 2,3,4,5
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