Add `String::replace_first` and `String::replace_last` by zachs18 · Pull Request #134316 · rust-lang/rust

zachs18 · 2024-12-14T21:15:39Z

Convenience methods that use match_indices and replace_range to efficiently replace a substring in a string without reallocating, if capacity (and the implementation of Vec::splice) allows.

The intra-doc link to str::replacen is a direct url-based link to str::replacen in std's docs to work around #98941. This means that when building only alloc's docs (and not std's), it will be a broken link. There is precedent for this e.g. in core::hint::spin_loop which links to std::thread::yield_now using a url-based link and thus is a dead link when only building core's docs.

ACP: rust-lang/libs-team#506

rustbot · 2024-12-14T21:15:48Z

r? @tgross35

rustbot has assigned @tgross35.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

tgross35 · 2024-12-14T21:20:56Z

I don't think I see any libs-api feedback on the other thread, and that is from a while back anyway. Could you file an ACP for this at https://github.com/rust-lang/libs-team/issues?

tgross35 · 2024-12-14T21:44:56Z

These methods would be convenient but I feel like they should probably come with an in-place replace alternative.

zachs18 · 2024-12-15T03:00:43Z

ACP opened: rust-lang/libs-team#506

@rustbot label S-waiting-on-ACP

I added String::replace_in_place (doing str::replace in-place) as a possible alternative/addition in the ACP, but I'll hold off on adding it if/until the ACP is approved with it.

bors · 2025-01-09T19:53:23Z

☔ The latest upstream changes (presumably #135286) made this pull request unmergeable. Please resolve the merge conflicts.

alex-semenyuk · 2025-02-21T20:21:01Z

@zachs18
Thanks for your contribution
Could you please rebase

tgross35 · 2025-02-21T20:23:06Z

@zachs18 Thanks for your contribution Could you please rebase

This is still waiting on the ACP

joshtriplett · 2025-10-21T15:19:44Z

@bors r+ rollup

ACP approved, PR approved.

Might be interested in the proposed replace_in_place in the future, but these seem clearly valuable and worth adding.

bors · 2025-10-21T15:19:48Z

📌 Commit 0243f5c has been approved by joshtriplett

It is now in the queue for this repository.

joshtriplett · 2025-10-21T15:20:03Z

@bors r-

r=me when the conflicts are fixed.

library/alloc/src/string.rs

tgross35 · 2025-10-21T20:30:07Z

Please also squash when you rebase, this PR has fixup commits

Rebased and modified by zachs18. Co-authored-by: zachs18 <8355914+zachs18@users.noreply.github.com>

rustbot · 2025-10-21T21:14:19Z

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Zalathar · 2025-10-23T01:04:44Z

The GCC job failed again in rollup: #148010 (comment)

@bors r-

tgross35 · 2025-10-23T05:08:10Z

@bors r=joshtriplett ,tgross35

bors · 2025-10-23T05:08:12Z

📌 Commit 8ed7fca has been approved by joshtriplett

It is now in the queue for this repository.

Rollup of 3 pull requests Successful merges: - #134316 (Add `String::replace_first` and `String::replace_last`) - #147713 (Retire ast::TyAliasWhereClauses.) - #148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #134316 - zachs18:string_replace_in_place_rebase, r=joshtriplett Add `String::replace_first` and `String::replace_last` Rebase of #97977 (cc `@WilliamVenner)` > Convenience methods that use `match_indices` and `replace_range` to efficiently replace a substring in a string without reallocating, if capacity (and the implementation of `Vec::splice`) allows. The intra-doc link to `str::replacen` is a direct url-based link to `str::replacen` in `std`'s docs to work around #98941. This means that when building only `alloc`'s docs (and not `std`'s), it will be a broken link. There is precedent for this e.g. in [`core::hint::spin_loop`](https://doc.rust-lang.org/nightly/src/core/hint.rs.html#214) which links to `std::thread::yield_now` using a [url-based link](https://github.com/rust-lang/rust/blob/master/library/core/src/hint.rs#L265) and thus is a dead link when only building `core`'s docs. ACP: rust-lang/libs-team#506

Rollup of 3 pull requests Successful merges: - rust-lang/rust#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang/rust#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang/rust#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

…base, r=joshtriplett Add `String::replace_first` and `String::replace_last` Rebase of rust-lang#97977 (cc `@WilliamVenner)` > Convenience methods that use `match_indices` and `replace_range` to efficiently replace a substring in a string without reallocating, if capacity (and the implementation of `Vec::splice`) allows. The intra-doc link to `str::replacen` is a direct url-based link to `str::replacen` in `std`'s docs to work around rust-lang#98941. This means that when building only `alloc`'s docs (and not `std`'s), it will be a broken link. There is precedent for this e.g. in [`core::hint::spin_loop`](https://doc.rust-lang.org/nightly/src/core/hint.rs.html#214) which links to `std::thread::yield_now` using a [url-based link](https://github.com/rust-lang/rust/blob/master/library/core/src/hint.rs#L265) and thus is a dead link when only building `core`'s docs. ACP: rust-lang/libs-team#506

Rollup of 3 pull requests Successful merges: - rust-lang#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

…base, r=joshtriplett Add `String::replace_first` and `String::replace_last` Rebase of rust-lang#97977 (cc `@WilliamVenner)` > Convenience methods that use `match_indices` and `replace_range` to efficiently replace a substring in a string without reallocating, if capacity (and the implementation of `Vec::splice`) allows. The intra-doc link to `str::replacen` is a direct url-based link to `str::replacen` in `std`'s docs to work around rust-lang#98941. This means that when building only `alloc`'s docs (and not `std`'s), it will be a broken link. There is precedent for this e.g. in [`core::hint::spin_loop`](https://doc.rust-lang.org/nightly/src/core/hint.rs.html#214) which links to `std::thread::yield_now` using a [url-based link](https://github.com/rust-lang/rust/blob/master/library/core/src/hint.rs#L265) and thus is a dead link when only building `core`'s docs. ACP: rust-lang/libs-team#506

Rollup of 3 pull requests Successful merges: - rust-lang#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 3 pull requests Successful merges: - rust-lang/rust#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang/rust#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang/rust#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

…base, r=joshtriplett Add `String::replace_first` and `String::replace_last` Rebase of rust-lang#97977 (cc `@WilliamVenner)` > Convenience methods that use `match_indices` and `replace_range` to efficiently replace a substring in a string without reallocating, if capacity (and the implementation of `Vec::splice`) allows. The intra-doc link to `str::replacen` is a direct url-based link to `str::replacen` in `std`'s docs to work around rust-lang#98941. This means that when building only `alloc`'s docs (and not `std`'s), it will be a broken link. There is precedent for this e.g. in [`core::hint::spin_loop`](https://doc.rust-lang.org/nightly/src/core/hint.rs.html#214) which links to `std::thread::yield_now` using a [url-based link](https://github.com/rust-lang/rust/blob/master/library/core/src/hint.rs#L265) and thus is a dead link when only building `core`'s docs. ACP: rust-lang/libs-team#506

Rollup of 3 pull requests Successful merges: - rust-lang#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 3 pull requests Successful merges: - rust-lang/rust#134316 (Add `String::replace_first` and `String::replace_last`) - rust-lang/rust#147713 (Retire ast::TyAliasWhereClauses.) - rust-lang/rust#148011 (Revert constification of `AsRef for Cow` due to inference failure ) r? `@ghost` `@rustbot` modify labels: rollup

rustbot assigned tgross35 Dec 14, 2024

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Dec 14, 2024

This comment has been minimized.

Sign in to view

zachs18 mentioned this pull request Dec 15, 2024

In-place String::replace_first and String::replace_last rust-lang/libs-team#506

Closed

rustbot added the S-waiting-on-ACP Status: PR has an ACP and is waiting for the ACP to complete. label Dec 15, 2024

tgross35 removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 27, 2024

bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Jan 9, 2025

tgross35 removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Feb 21, 2025

bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Oct 21, 2025

bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 21, 2025

programmerjake requested changes Oct 21, 2025

View reviewed changes

library/alloc/src/string.rs Outdated Show resolved Hide resolved

tgross35 removed the S-waiting-on-ACP Status: PR has an ACP and is waiting for the ACP to complete. label Oct 21, 2025

tgross35 reviewed Oct 21, 2025

View reviewed changes

library/alloc/src/string.rs Outdated Show resolved Hide resolved

zachs18 mentioned this pull request Oct 21, 2025

Tracking Issue for string_replace_in_place #147949

Open

4 tasks

Add String::replace_first and String::replace_last

8ed7fca

Rebased and modified by zachs18. Co-authored-by: zachs18 <8355914+zachs18@users.noreply.github.com>

zachs18 force-pushed the string_replace_in_place_rebase branch from 0243f5c to 8ed7fca Compare October 21, 2025 21:14

Zalathar mentioned this pull request Oct 22, 2025

Rollup of 5 pull requests #148010

Closed

bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 23, 2025

zachs18 force-pushed the string_replace_in_place_rebase branch from 271b10c to 8ed7fca Compare October 23, 2025 03:37

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 23, 2025

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 23, 2025

jhpratt mentioned this pull request Oct 23, 2025

Rollup of 3 pull requests #148014

Merged

bors merged commit 4491efb into rust-lang:master Oct 23, 2025
22 checks passed

rustbot added this to the 1.92.0 milestone Oct 23, 2025

github-actions bot mentioned this pull request Oct 30, 2025

Toolchain upgrade to nightly-2026-01-30 flux-rs/flux#1345

Draft

zachs18 deleted the string_replace_in_place_rebase branch November 10, 2025 17:49

Uh oh!

Conversation

zachs18 commented Dec 14, 2024 • edited by Dylan-DPC Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

rustbot commented Dec 14, 2024

Uh oh!

tgross35 commented Dec 14, 2024

Uh oh!

tgross35 commented Dec 14, 2024

Uh oh!

This comment has been minimized.

zachs18 commented Dec 15, 2024

Uh oh!

bors commented Jan 9, 2025

Uh oh!

alex-semenyuk commented Feb 21, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

tgross35 commented Feb 21, 2025

Uh oh!

joshtriplett commented Oct 21, 2025

Uh oh!

bors commented Oct 21, 2025

Uh oh!

joshtriplett commented Oct 21, 2025

Uh oh!

Uh oh!

Uh oh!

tgross35 commented Oct 21, 2025

Uh oh!

rustbot commented Oct 21, 2025

Uh oh!

Zalathar commented Oct 23, 2025

Uh oh!

tgross35 commented Oct 23, 2025

Uh oh!

bors commented Oct 23, 2025

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

10 participants

zachs18 commented Dec 14, 2024 •

edited by Dylan-DPC

Loading

alex-semenyuk commented Feb 21, 2025 •

edited

Loading