Simplifying Text Extraction with Rexx PARSE
Stop fighting with inconsistent regex engines. Learn how Rexx's PARSE instruction uses simple templates to extract text fields consistently across Linux, Windows, and mainframes.
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rexxAwk Associative Arrays: Aggregation Without the Sort Pipeline
Awk's associative arrays replace sort | uniq -c with a single-pass aggregation. Learn the auto-vivification trap, the 'in' operator, and when the in-memory approach stops scaling.
awkCount Field Occurrences in Text Streams Using awk Associative Arrays
Learn how to tally occurrences of a specific field in text streams using awk’s associative arrays, with steps for setup, execution, verification, and notes on memory limits.
Harnessing Rexx’s Built‑In REGEXP: A Practical Guide to Pattern Matching
Rexx’s built‑in REGEXP function lets you perform POSIX‑style pattern matching without external libraries. Learn how to extract substrings, pre‑compile patterns for speed, and avoid common pitfalls like backtracking and legacy support gaps.
GNU awk FS Regular Expression Behavior with Variable-Length Delimiters
GNU awk (gawk) allows the Field Splitter ( FS ) to be defined as a regular expression, enabling the division of records based on complex patterns rather than single characters. This is particularly useful when processing logs with inconsistent whitespace or multi-character delimiters. A design uncertainty arises when FS is set to a regex that matches variabl