Clippy lint · Correctness · checked with Clippy 0.1.99

clippy::invalid_regex: Checks regex creation (with Regex::new, RegexBuilder::new, or RegexSet::new) for correct regex syntax

What it meansChecks regex creation (with Regex::new, RegexBuilder::new, or RegexSet::new) for correct regex syntax. It is in the correctness group and denied by default (the build fails).

Does it matter?

This will lead to a runtime panic.

Code that is almost certainly wrong. Denied by default: the build fails until you fix it or allow it.

How to fix it

Clippy does not fix this one automatically. Change the code by hand:

Flagged

Regex::new("(")

Write this instead

Regex::new("\(")

Turn it off, or on

Allow it where it does not fit your code, as narrowly as you can:

On one item

#[allow(clippy::invalid_regex)]
fn my_function() { /* ... */ }

Whole crate (Cargo.toml)

[lints.clippy]
invalid_regex = "allow"

One run

cargo clippy -- -A clippy::invalid-regex

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.

Correctnessgroup

denydefault level

nofixed by cargo clippy --fix

pre 1.29.0added in Rust

Clippy's own documentation

What it does

Checks regex creation (with Regex::new, RegexBuilder::new, or RegexSet::new) for correct regex syntax.

Why is this bad?

This will lead to a runtime panic.

Example

Regex::new("(")

Use instead:

Regex::new("\(")

From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.

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