Using Rexx PARSE for Clean Command‑Line Argument Handling
Learn how Rexx’s PARSE instruction can split strings, extract typed fields, and simplify command‑line or data parsing without external libraries.
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Choosing Between PARSE and RXREGEX for Log Parsing in Rexx
A decision guide for Rexx log parsing: when the built-in PARSE instruction is enough, when the RXREGEX library earns its dependency, and a script that validates both against the same line.
Diagnosing Rexx PARSE Instruction Failures in String Tokenization
A step‑by‑step diagnostic guide for fixing Rexx PARSE instruction failures when tokenizing strings, including checks, fixes, and escalation criteria.
Designing Rexx Automation Scripts Around Dynamic Typing and Variable Scope
An architecture note on designing Rexx automation scripts around its string-everything typing and flexible variable scoping — where the model fits, the smallest safe structure, and the failure modes that should change your design.
Rexx PARSE: Pattern-Based String Extraction Without Regex
Rexx's PARSE extracts structured data using literal delimiters, positional patterns, and variable placeholders — no regex. One statement handles logs, fixed-width records, arguments, and stems. Trade-offs: no alternation, whitespace-sensitive templates.
Parsing Structured Text Files in Rexx Using Template Patterns
Learn how to use the Rexx PARSE instruction to extract data from delimited and fixed-width text files using template patterns, stem arrays, and validation checks.
Rexx SUBSTR: 1-Based Indexing Is a Feature, Not an Off-by-One Bug
Rexx SUBSTR counts from 1, not 0. That makes fixed-width extraction arithmetic-free — and breaks ported code. Here's how to use it, plus the padding and byte-counting traps.
Choosing Between PARSE and SUBSTR for Data Extraction in Rexx
Decide when to use PARSE versus SUBSTR in Rexx for efficient string parsing, with a comparison table and runnable examples.
Simplify Bulk Data in Rexx with Stem Variables
Learn how Rexx stem variables let you store and process collections without repetitive code, with a clear example and best‑practice trade‑offs.