What is the regex for screaming_snake_case?

The regex pattern for screaming_snake_case is `^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$`. This pattern validates screaming_snake_case constant name (uppercase with underscores).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$/;` 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-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

By default, yes. To make it case-insensitive, add the `i` flag in JavaScript (`/^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$/i`) or use `re.IGNORECASE` in Python.

Regex for SCREAMING_SNAKE_CASE

Regex Pattern

^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$

SCREAMING_SNAKE_CASE constant name (uppercase with underscores)

Quick Answer

The regex pattern for screaming_snake_case is `^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$`. SCREAMING_SNAKE_CASE constant name (uppercase with underscores). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
MAX_VALUE	✓ Matches
API_BASE_URL	✓ Matches
HTTP_STATUS_OK	✓ Matches
maxValue	✗ No match
max_value	✗ No match
MAX	✗ No match
Max_Value	✗ No match

Code Examples

javascript

const regex = /^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$/;
const isValid = regex.test(value);

python

import re
pattern = r'^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$/', $value)) {
    echo "valid";
}

java

String pattern = "^[A-Z][A-Z0-9]*(?:_[A-Z0-9]+)+$";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

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camelCase identifier (starts lowercase, no separators)