Match Simple Slugs

Match lowercase slugs made of letters, digits and single hyphens.

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Regular expression
Reference

Regex quick reference

^ · $
Start/end; m = lines.
[abc] · \d
Listed character / digit.
* · + · ?
Zero or more, one or more, optional.
(...)
Capture a numbered group.
(?<name>...)
Named capture.
(?=...)
Ahead; lookbehind varies.
i · m · s
Ignore case / line anchors / dot-newline.
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Verified Fixture FX-R07

What it does

Check that a whole text is a simple slug: lowercase letters and digits separated by single hyphens.

How to use it

  1. Load the example or paste a slug.
  2. Check the counterexample.
  3. Use the whole-text anchors as written.

Verified example

Example

Text "regex-parser"

JavaScript · This browser
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: "regex-parser"

Python re · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: "regex-parser"

PCRE2-8 · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: "regex-parser"

Go regexp · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: "regex-parser"

Counterexample

Text "-regex"

JavaScript · This browser
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: no match

Python re · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: no match

PCRE2-8 · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: no match

Go regexp · Local WASM
^[a-z0-9]+(?:-[a-z0-9]+)*$

Result: no match

Recorded by running fixture FX-R07 on : rp.js@1 on Node v24.21.0 (V8), v24.21.0, CPython 3.14.2 (Pyodide 314.0.7), PCRE2 10.48, go1.27.1. JavaScript results come from the rp.js@1 core on Node’s V8; your browser runs the same core.

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