IBM TSO/E REXX User Manual

A period in a template acts as a place holder. The data that corresponds to the
period is not assigned to a variable name. You can use a period as a "dummy
variable" within a group of variables or at the end of a template to collect unwanted
information.
PARSE VALUE 'Value with Periods in it.' WITH pattern . type .
/* pattern contains 'Value' */
/* type contains 'Periods' */
/* the periods replace the words "with" and "in it." */
String
You can use a string in a template to separate data as long as the data includes the
string as well. The string becomes the point of separation and is not included as
data.
phrase = 'To be, or not to be?' /* phrase containing comma */
PARSE VAR phrase part1 ',' part2 /* template containing comma */
/* as string separator */
/* part1 contains 'To be' */
/* part2 contains ' or not to be?' */
In this example, notice that the comma is not included with ’To be ’ because the
comma is the string separator.
Variable
When you do not know in advance what string to specify as separator in a
template, you can use a variable enclosed in parentheses. The variable value must
be included in the data.
separator = ','
phrase = 'To be, or not to be?'
PARSE VAR phrase part1 (separator) part2
/* part1 contains 'To be' */
/* part2 contains ' or not to be?' */
Again, in this example, notice that the comma is not included with ’To be ’ because
the comma is the string separator.
Number
You can use numbers in a template to indicate the column at which to separate
data. An unsigned integer indicates an absolute column position and a signed
integer indicates a relative column position.
v Absolute column position
An unsigned integer or an integer prefixed with an equal sign (=) in a template
separates the data according to absolute column position. The first segment
starts at column 1 and goes up to, but does not include, the information in the
column number specified. The subsequent segments start at the column
numbers specified.
quote = 'Ignorance is bliss.'
....+....1....+....2
PARSE VAR quote part1 5 part2
/* part1 contains 'Igno' */
/* part2 contains 'rance is bliss.' */
This example could have also been coded as follows. Note the explicit use of the
column 1 indicator prior to part1 that was implied in the previous example and
the use of the =5 part2 to indicate the absolute position, column 5.
quote = 'Ignorance is bliss.'
....+....1....+....2
Parsing Data
90
z/OS V1R1.0 TSO/E REXX User’s Guide

IBM TSO/E REXX Specifications

General

Brand	IBM
Model	TSO/E REXX
Category	Computer Hardware
Language	English

Summary

Part 1. Learning the REXX Language

Chapter 1. Introduction

Explains the REXX programming language, its features, and suitability for various users.

Chapter 2. Writing and Running a REXX Exec

Details the process of writing, running, and understanding REXX execs, including syntax rules and common issues.

Chapter 3. Using Variables and Expressions

Covers REXX variables, expressions, operators, and tracing techniques for data manipulation and calculations.

Chapter 4. Controlling the Flow Within an Exec

Explains how to alter REXX exec execution using conditional, looping, and interrupt instructions.

Chapter 5. Using Functions

Describes REXX functions, including built-in, user-written, and packages, and how to use them.

Chapter 6. Writing Subroutines and Functions

Guides on writing, calling, and passing information to REXX subroutines and functions.

Chapter 7. Manipulating Data

Covers REXX data manipulation using compound variables, stems, and various parsing techniques.

Part 2. Using REXX

Chapter 8. Entering Commands from an Exec

Explains how REXX execs can interact with the operating system by issuing TSO/E and host commands.

Chapter 9. Diagnosing Problems Within an Exec

Details techniques for diagnosing and debugging REXX execs using tracing and special variables.

Chapter 10. Using TSO/E External Functions

Describes TSO/E external functions available for interacting with the system and performing specific tasks.

Chapter 11. Storing Information in the Data Stack

Explains how to use the REXX data stack for temporary storage, passing information, and managing buffers.

Chapter 12. Processing Data and Input/Output Processing

Covers dynamic REXX expression modification and processing data to/from data sets using EXECIO.

Chapter 13. Using REXX in TSO/E and Other MVS Address Spaces

Explains how to run REXX execs in TSO/E and non-TSO/E MVS address spaces and available services.

Part 3. Appendixes

Appendix A. Allocating Data Sets

Guides on creating and allocating data sets, including checklists for ISPF/PDF and ALLOCATE commands.

Appendix B. Specifying Alternate Libraries with the ALTLIB Command

Details using the ALTLIB command to specify and manage alternative libraries for implicit execution.

Appendix C. Comparisons Between CLIST and REXX

Compares REXX and CLIST languages, highlighting similarities and differences in features and capabilities.

Appendix D. Notices

Provides legal notices, warranty disclaimers, copyright, and trademark information.

Bibliography

TSO/E Publications

Lists IBM publications related to TSO/E, including administration, CLISTs, and general information.

Related Publications

Lists IBM publications related to z/OS MVS and ISPF, covering system programming and administration.

Index