v0.2.3

Changed

• Updated coregex to v0.12.8 (from v0.10.6) — 22 releases with major improvements
• Updated golang.org/x/sys to v0.42.0 (from v0.40.0)
• Fixed staticcheck QF1012: replaced WriteString(Sprintf) with Fprintf

Key coregex improvements (v0.10.7 → v0.12.8)

Area	Highlight
Anchored patterns	FindAll 600x faster
UseAnchoredLiteral	32-133x speedup
Prefix fast path	319-552x speedup
UseMultilineReverseSuffix	3.5-5.7x speedup
Cross-product literals	14x speedup (regexdna)
PikeVM	1.68x faster than stdlib, sparse-dispatch for dot patterns
New APIs	Streaming ReplaceAll, DFA-first FindSubmatchAt
Bug fixes	Non-greedy quantifiers, word boundary, BoundedBacktracker spans

Full Changelog: v0.2.2...v0.2.3

v0.2.2

Changed

• Updated coregex to v0.10.6
  • v0.10.4: Thread-safety fix with sync.Pool for concurrent Regexp usage
  • v0.10.5: CompositeSearcher backtracking fix for overlapping patterns (\w+[0-9]+)
  • v0.10.6: CompositeSequenceDFA (25x faster overlapping char classes, 300 MB/s)
  • v0.10.6: FindAllIndexCompact API for near-zero allocations

Full Changelog: v0.2.1...v0.2.2

uawk v0.2.2 (2026-01-14T11:06:49Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• 626d24c: deps: update coregex to v0.10.6 (#6) (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.2.2

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.2.1

Performance

• Lazy ENVIRON loading for 40-60% faster VM creation
  • os.Environ() syscall deferred until first ENVIRON access
  • Most AWK programs don't use ENVIRON, now they pay zero overhead

Benchmark Results

Metric	Before	After	Improvement
VM creation (no ENVIRON)	87μs	38μs	-56%
Memory allocation	63KB	36KB	-43%
Allocations	150	25	-83%

Real-world benchmarks (awkbench 1MB):

• wordcount: -17%
• groupby: -21%
• filter: -25%

Installation

go install github.com/kolkov/uawk/cmd/uawk@v0.2.1

Full Changelog: v0.2.0...v0.2.1

uawk v0.2.1 (2026-01-12T20:08:10Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

⚡ Performance

• 43b48d1: perf: Lazy ENVIRON for v0.2.1 (#5) (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.2.1

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.2.0

uawk v0.2.0 - Parallel Execution

High-performance AWK interpreter for Go!

All 16/16 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

What's New

Added

• Parallel execution with -j N flag for concurrent multi-file processing
  • Automatic detection of parallel-safe programs
  • Worker pool processes files concurrently with output ordering preserved
  • -dp flag to check if program can be parallelized

Performance

• Specialized global array opcodes eliminate scope switch overhead
  • wordcount: 281ms → 271ms (7% improvement, now beats GoAWK)
• email benchmark: 181ms → 32ms (5.7x faster, was broken before)

Fixed

• CompositeSearcher backtracking bug for overlapping patterns
  • Patterns like [a-z.]+\.com now match correctly

Changed

• Updated coregex to v0.10.3

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.2.0

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Parallel processing (4 workers):
uawk -j 4 '{ sum += $1 } END { print sum }' *.log

# Performance mode:
uawk --no-posix '/pattern/ { print }' file.txt

Full Changelog: v0.1.6...v0.2.0

v0.1.6

uawk v0.1.6 - VM Performance V2

High-performance AWK interpreter for Go!

15/16 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

What's New

Added

• --posix / --no-posix CLI flags for regex mode selection
• POSIXRegex option in uawk.Config for library usage
• RegexConfig and VMConfig for fine-grained control

Performance

• VM Performance V2: Type specialization, opcode fusion, stack optimization
  • Static type inference for numeric operations
  • Peephole optimizer for instruction fusion
  • Optimized stack operations (PeekPop, ReplaceTop)
• --no-posix mode disables leftmost-longest matching for faster regex
• Up to 12% improvement on some patterns in fast mode

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.6

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Performance mode (faster regex):
uawk --no-posix '/pattern/ { print }' file.txt

Full Changelog: v0.1.5...v0.1.6

v0.1.5

uawk v0.1.5 (2026-01-06T22:59:27Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• 19e6919: deps: upgrade coregex to v0.10.0 (#2) (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.5

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.1.4

uawk v0.1.4 (2026-01-06T21:11:29Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• 2c9c268: deps: upgrade coregex to v0.9.5 (#1) (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.4

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.1.3

uawk v0.1.3 (2026-01-06T11:12:54Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• 27df772: deps: upgrade coregex to v0.9.2 (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.3

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.1.2

uawk v0.1.2 (2026-01-05T01:16:32Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• ab5b6c1: deps: upgrade coregex to v0.9.1 (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.2

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues

v0.1.1

uawk v0.1.1 (2026-01-04T23:10:20Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

🎨 Other

• 3c2a193: deps: upgrade coregex to v0.9.0 (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.1.1

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues