swiftlang/swift-experimental-string-processing

An early experimental general-purpose pattern matching engine for Swift.

Stars: 308
Forks: 52
Open beginner issues: 0
Indexed issues: 62
Avg merge: 12h 45m
Merged PRs (30d): 2

Dominant language: Swift
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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62 open issues indexed

Slow regex performance Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-experimental-string-processing#853 · 5 reactions · Opened Feb 16, 2026
Add a CODEOWNERS file to this repo Open

Difficulty 1/5 Under an hour Newbie friendliness 50/100

swiftlang/swift-experimental-string-processing#848 · Opened Jan 6, 2026
Convert closure-based methods to typed throws Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#834 · Opened Oct 9, 2025
Log line matcher shows slow performance in failure Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#823 · Opened Sep 15, 2025
Regex misses Windows-style newlines Open

bug semantics

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#822 · 3 comments · Opened Aug 15, 2025
Inserting regex into literal regex expressions Open

enhancement swift-evolution-required

Difficulty 5/5 Over a week Newbie friendliness 30/100

swiftlang/swift-experimental-string-processing#821 · Opened Jul 15, 2025
Slow Swift.Regex for certain pattern. 9 seconds to parse 20k text. Open

bug performance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#816 · 1 reaction · Opened Jun 3, 2025
trimmingPrefixOrNil Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#814 · 1 comment · Opened May 7, 2025
Status of this work not well-represented Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#802 · 2 comments · 1 reaction · Opened Jan 16, 2025
When passing a collection to `Set.contains(_:)`, forward to `Set.isSuperset(of:)` Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

swiftlang/swift-experimental-string-processing#796 · 4 comments · 2 reactions · Opened Jan 3, 2025
Regex match hangs on non-matching string Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#793 · Opened Dec 19, 2024
Regex compare not case-insensitive for single optional characters Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#852 · 2 comments · Opened Dec 13, 2024
Regex is not Sendable Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#792 · 1 comment · 9 reactions · Opened Dec 11, 2024
Application of regex `([^a-zA-Z]|^)(text)(?=([^a-zA-Z]|$))` crashes Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#782 · 3 comments · Opened Oct 25, 2024
Preserve word boundary cache across multiple matches Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#770 · Opened Oct 9, 2024
Is CustomConsumingRegexComponent incapable of declaring the start of a match? Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

swiftlang/swift-experimental-string-processing#765 · 1 comment · Opened Sep 24, 2024
Regex character classes fail with single scalar, non-NFC range bound elements Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#750 · 1 comment · Opened Jul 10, 2024
Regex does not match isolated combining mark as whitespace if preceded by whitespace Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#724 · 1 comment · Opened Feb 24, 2024
"\r?" regex doesn't seem to work properly Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#718 · 1 comment · Opened Feb 8, 2024
Don't operate on a collection and a range of indices if you can help it. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#711 · 1 comment · Opened Jan 11, 2024
Creating a `ChoiceOf` from an array Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

swiftlang/swift-experimental-string-processing#701 · 1 comment · 3 reactions · Opened Dec 1, 2023
`contains<C>(_:)` does not behave as expected Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-experimental-string-processing#694 · 1 comment · 1 reaction · Opened Sep 28, 2023
RegexBuilder module is unavailable on Windows Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-experimental-string-processing#693 · Opened Sep 14, 2023
Add [Sub]String specializations for `contains` and other search algorithms Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#687 · 5 reactions · Opened Jul 20, 2023
Unexpected compiler error for CharacterClass.inverted Open

swiftlang/swift-experimental-string-processing#672 · 3 comments · 1 assignee · Opened May 21, 2023
SE-0351 was accepted with `mapOutput`, but it's not implemented Open

swiftlang/swift-experimental-string-processing#668 · 4 comments · 5 reactions · 1 assignee · Opened May 4, 2023
Add benchmarks for string algorithms Open

swiftlang/swift-experimental-string-processing#663 · 1 assignee · Opened Apr 14, 2023
Add unit tests for advanced string algorithms Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#662 · Opened Apr 14, 2023
Verify scalar semantics in quantifier fast path Open

swiftlang/swift-experimental-string-processing#661 · 1 comment · 1 assignee · Opened Apr 14, 2023
Refactor and unify code for built-in character class matching Open

swiftlang/swift-experimental-string-processing#645 · 1 reaction · 1 assignee · Opened Apr 3, 2023
Regex non-deterministicly fails Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#639 · 7 comments · Opened Mar 5, 2023
Match.subscript fails to properly cast non-matched Capture Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#624 · 8 comments · Opened Jan 21, 2023
Swift Regex Builders will crash if a named capture group is optional Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#623 · 1 comment · 4 reactions · Opened Dec 22, 2022
Drop "experimental" from the repo name Open

swiftlang/swift-experimental-string-processing#622 · 2 reactions · 1 assignee · Opened Dec 15, 2022
Wider than expected performance gap between NSRegularExpression and StringProcessing Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

swiftlang/swift-experimental-string-processing#612 · Opened Nov 2, 2022
RegexBuilder w/ custom component "fails to cast," crashes Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-experimental-string-processing#805 · 2 comments · Opened Oct 30, 2022
'behavior' Parameter Passed In The Wrong Order in Regex Builder Refactoring Open

swiftlang/swift-experimental-string-processing#608 · 3 comments · 2 assignees · Opened Oct 2, 2022
`Anchor.inverted` does not have any effect on most members Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#584 · Opened Jul 15, 2022
Large regression in word boundary regexes Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-experimental-string-processing#567 · 2 comments · Opened Jul 12, 2022
Fix failing DSL tests Open

swiftlang/swift-experimental-string-processing#555 · 1 assignee · Opened Jul 6, 2022
[Benchmark] Excessive (and expensive) backtracking Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#483 · 6 comments · Opened Jun 15, 2022
Large quantifiers hit assertion in Instruction.Payload Open

swiftlang/swift-experimental-string-processing#473 · 1 comment · 1 assignee · Opened Jun 8, 2022
Implement `UnicodeScalar.init?(named:)` Open

swiftlang/swift-experimental-string-processing#465 · 1 reaction · 1 assignee · Opened Jun 1, 2022
Implement the special Java character properties Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-experimental-string-processing#437 · 1 comment · Opened May 25, 2022
Update integration doc on README Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

swiftlang/swift-experimental-string-processing#427 · Opened May 22, 2022
Diagnostic Improvements Open

swiftlang/swift-experimental-string-processing#394 · 1 assignee · Opened May 10, 2022
Implement case-folded comparisons as stdlib SPI Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-experimental-string-processing#389 · Opened May 9, 2022
Implement parser warnings Open

swiftlang/swift-experimental-string-processing#380 · 1 assignee · Opened May 5, 2022
Fix matching of `\N` Open

swiftlang/swift-experimental-string-processing#375 · 8 comments · 1 assignee · Opened May 3, 2022
Near-Future Work Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

swiftlang/swift-experimental-string-processing#370 · 6 reactions · Opened Apr 29, 2022

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