Parsing Fixed‑Format Text in Rexx with the PARSE Instruction
Learn how Rexx's PARSE instruction replaces manual scanning loops with a declarative template, and see a worked CSV example you can run today.
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rexxReadOnlySpan<T> in Practice: Slicing Strings Without the Garbage
Substring() copies data to the heap. ReadOnlySpan<T> gives you a view into the original buffer instead. Here is how that changes parsing loops, where it stops working, and how to verify the difference.
csharpRexx 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.