What is the regex for content-type header?

The regex pattern for content-type header is `^[a-zA-Z]+\/[a-zA-Z0-9.+-]+(?:\s*;\s*[a-zA-Z-]+=\S+)*$`. This pattern validates http content-type header with optional parameters.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^[a-zA-Z]+\\/[a-zA-Z0-9.+-]+(?:\s*;\s*[a-zA-Z-]+=\S+)*$/;` 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'^[a-zA-Z]+\/[a-zA-Z0-9.+-]+(?:\s*;\s*[a-zA-Z-]+=\S+)*$', 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 Content-Type Header

Regex Pattern

^[a-zA-Z]+\/[a-zA-Z0-9.+-]+(?:\s*;\s*[a-zA-Z-]+=\S+)*$

HTTP Content-Type header with optional parameters

Quick Answer

The regex pattern for content-type header is `^[a-zA-Z]+\/[a-zA-Z0-9.+-]+(?:\s*;\s*[a-zA-Z-]+=\S+)*$`. HTTP Content-Type header with optional parameters. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
text/html; charset=utf-8	✓ Matches
application/json	✓ Matches
multipart/form-data; boundary=abc	✓ Matches
text	✗ No match
not a content type	✗ No match
(empty)	✗ No match

Code Examples

javascript

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

python

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

ruby

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

php

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

java

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

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