How do I test this regex in JavaScript and TypeScript?

Use regex.test(): const regex = / ]*>/g; const isValid = regex.test(inputString);

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

A valid matching string is " ". A non-matching string is "Plain text with no markup".

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.

HomeRegex LibraryHTML Opening & Closing Tag Stripper Regex

100% Client-Side • 0 B Data Leaves Browser

web

HTML Opening & Closing Tag Stripper Regex

Finds and strips opening, closing, and self-closing HTML/XML markup tags from rich text strings.

Regular Expression Pattern:

/<\/?[a-zA-Z][^>]*>/g

Valid Match Example:

Invalid / Non-Match Example:

Plain text with no markup

Regex Syntax Breakdown & Explanation

•< : Opening bracket
•\/? : Optional forward slash for closing tags
•[a-zA-Z] : Starts with tag element letter
•[^>]*> : Matches all attribute characters until closing bracket

Implementation in Popular Languages

JavaScript / TypeScript

const regex = /<\/?[a-zA-Z][^>]*>/g;
const isValid = regex.test("<div class="active" data-id="10">");
console.log(isValid); // true

Python (re)

import re

pattern = r"<\/?[a-zA-Z][^>]*>"
match = re.match(pattern, "<div class="active" data-id="10">")
print(bool(match)) # True

Go (regexp)

package main
import (
  "fmt"
  "regexp"
)

func main() {
  re := regexp.MustCompile(`<\/?[a-zA-Z][^>]*>`)
  fmt.Println(re.MatchString("<div class="active" data-id="10">"))
}

Frequently Asked Questions

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

The regular expression pattern is /<\/?[a-zA-Z][^>]*>/g. Finds and strips opening, closing, and self-closing HTML/XML markup tags from rich text strings.