What is the regex for markdown code block?

The regex pattern for markdown code block is `^```(?:[a-zA-Z]*)?$`. This pattern validates markdown fenced code block opening/closing delimiter.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^```(?:[a-zA-Z]*)?$/;` 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]*)?$', 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 Markdown Code Block

Regex Pattern

^```(?:[a-zA-Z]*)?$

Markdown fenced code block opening/closing delimiter

Quick Answer

The regex pattern for markdown code block is `^```(?:[a-zA-Z]*)?$`. Markdown fenced code block opening/closing delimiter. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
```	✓ Matches
```javascript	✓ Matches
```python	✓ Matches
``	✗ No match
` code `	✗ No match
not code	✗ No match

Code Examples

javascript

const regex = /^```(?:[a-zA-Z]*)?$/;
const isValid = regex.test(value);

python

import re
pattern = r'^```(?:[a-zA-Z]*)?$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^```(?:[a-zA-Z]*)?$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^```(?:[a-zA-Z]*)?$/', $value)) {
    echo "valid";
}

java

String pattern = "^```(?:[a-zA-Z]*)?$";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

Related Regex Patterns

Markdown Heading

Markdown heading (# to ######)

Markdown Link

Markdown inline link [text](url)

Markdown Image

Markdown inline image ![alt](src)

Markdown Bold

Markdown bold text (**text** or __text__)

camelCase Word

camelCase identifier (starts lowercase, no separators)

snake_case Word

snake_case identifier (lowercase with underscores)