What is the regex for html tag?

The regex pattern for html tag is ` ]*)?\/?>`. This pattern validates any html tag (opening, closing, or self-closing).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = / ]*)?\\/?>/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r' ]*)?\/?>', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

This pattern explicitly handles both uppercase and lowercase via the character classes. No additional flags needed.

Regex for HTML Tag

Regex Pattern

<\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\/?>

Any HTML tag (opening, closing, or self-closing)

Quick Answer

The regex pattern for html tag is `<\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\/?>`. Any HTML tag (opening, closing, or self-closing). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
<div>	✓ Matches
</p>	✓ Matches
<img src="x.jpg" />	✓ Matches
<h1 class="title">	✓ Matches
not a tag	✗ No match
<>	✗ No match
< invalid>	✗ No match

Code Examples

javascript

const regex = /<\\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\\/?>/;
const isValid = regex.test(value);

python

import re
pattern = r'<\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\/?>'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /<\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\/?>/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/<\\/?[a-zA-Z][a-zA-Z0-9]*(?:\s+[^>]*)?\\/?>/', $value)) {
    echo "valid";
}

java

String pattern = "<\\/?[a-zA-Z][a-zA-Z0-9]*(?:\\s+[^>]*)?\\/?>";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

Related Regex Patterns

HTML Comment

HTML comment block (multi-line safe)

Email Address

Validates a standard email address format

Email (RFC 5322 Compliant)

RFC 5322 compliant email validation with label length limits

URL (HTTP/HTTPS)

Validates HTTP and HTTPS URLs

URL (Any Protocol)

Matches URLs with any protocol (http, https, ftp, ws, etc.)

Domain Name

Validates a domain name (no protocol)