What is an example of a matching and non-matching string?

A valid matching string is "universal-developer-tools-2026". A non-matching string is "Invalid--Slug_Name".

Is this regex safe from ReDoS (Catastrophic Backtracking)?

Yes, this pattern is optimized for linear execution time and safe for browser-side validation without locking up the UI thread.

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SEO Friendly URL Slug Regex

Q: How do I test this regex in JavaScript and TypeScript?

Use regex.test(): const regex = /^[a-z0-9]+(?:-[a-z0-9]+)*$/; const isValid = regex.test(inputString);

Enforces lowercase alphanumeric words separated only by single hyphens with no trailing dashes.

Regular Expression Pattern:

/^[a-z0-9]+(?:-[a-z0-9]+)*$/

Valid Match Example:

universal-developer-tools-2026

Invalid / Non-Match Example:

Invalid--Slug_Name

Regex Syntax Breakdown & Explanation

•^[a-z0-9]+ : Starts with lowercase letter or digit
•(?:-[a-z0-9]+)*$ : Hyphen followed by alphanumeric segment repeated

Implementation in Popular Languages

JavaScript / TypeScript

const regex = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;
const isValid = regex.test("universal-developer-tools-2026");
console.log(isValid); // true

Python (re)

import re

pattern = r"^[a-z0-9]+(?:-[a-z0-9]+)*$"
match = re.match(pattern, "universal-developer-tools-2026")
print(bool(match)) # True

Go (regexp)

package main
import (
  "fmt"
  "regexp"
)

func main() {
  re := regexp.MustCompile(`^[a-z0-9]+(?:-[a-z0-9]+)*$`)
  fmt.Println(re.MatchString("universal-developer-tools-2026"))
}

Frequently Asked Questions

Everything you need to know regarding specifications, syntax, and security best practices.

The regular expression pattern is /^[a-z0-9]+(?:-[a-z0-9]+)*$/. Enforces lowercase alphanumeric words separated only by single hyphens with no trailing dashes.