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Add string slicing support (#2639)

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* Initial plan

* Add string slicing support to yq

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* Fix sliceStringNode signature and fix test descriptions/expressions

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* Update pkg/yqlib/operator_slice.go

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* Fix array slice out-of-bounds panic with very negative indices

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* S2-S4: tighten lexer condition, fix doc header, add Unicode example

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* Fix spelling: multibyte -> multi-byte in Unicode test subdescription

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---------

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Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Copilot
2026-04-06 19:29:07 +10:00
committed by GitHub
co-authored by mikefarah Copilot copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Mike Farah
parent 68f0322ba3
commit 3b2423e871
7 changed files with 203 additions and 10 deletions
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pkg/yqlib/doc/operators/headers/slice-array.md
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@@ -1,5 +1,5 @@
# Slice/Splice Array
# Slice Array or String
The slice array operator takes an array as input and returns a subarray. Like the `jq` equivalent, `.[10:15]` will return an array of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array.
The slice operator works on both arrays and strings. Like the `jq` equivalent, `.[10:15]` will return a subarray (or substring) of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array or string.
You may leave out the first or second number, which will refer to the start or end of the array respectively.
You may leave out the first or second number, which will refer to the start or end of the array or string respectively.