What is the regex for git branch name?

The regex pattern for git branch name is `^(?!.*\.\.)(?!.*\/\/)(?!\/)[a-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$`. This pattern validates valid git branch name following git-check-ref-format rules.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^(?!.*\.\.)(?!.*\\/\\/)(?!\\/)[a-zA-Z0-9\/_.-]+(?<!\.)(?<!\\/)(?<!\.lock)$/;` 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-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$', 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-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$/i`) or use `re.IGNORECASE` in Python.

Regex for Git Branch Name

Q: How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^(?!.*\.\.)(?!.*\\/\\/)(?!\\/)[a-zA-Z0-9\/_.-]+(?<!\.)(?<!\\/)(?<!\.lock)$/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

Q: How do I use this regex in Python?

In Python, use `import re; re.match(r'^(?!.*\.\.)(?!.*\/\/)(?!\/)[a-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Q: Is this regex case-sensitive?

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

Regex Pattern

^(?!.*\.\.)(?!.*\/\/)(?!\/)[a-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$

Valid git branch name following git-check-ref-format rules

Quick Answer

The regex pattern for git branch name is `^(?!.*\.\.)(?!.*\/\/)(?!\/)[a-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$`. Valid git branch name following git-check-ref-format rules. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
main	✓ Matches
feature/my-feature	✓ Matches
release/v1.0.0	✓ Matches
fix/bug-123	✓ Matches
..invalid	✗ No match
branch..name	✗ No match
/leading-slash	✗ No match
name.lock	✗ No match

Code Examples

javascript

const regex = /^(?!.*\.\.)(?!.*\\/\\/)(?!\\/)[a-zA-Z0-9\/_.-]+(?<!\.)(?<!\\/)(?<!\.lock)$/;
const isValid = regex.test(value);

python

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

ruby

pattern = /^(?!.*\.\.)(?!.*\/\/)(?!\/)[a-zA-Z0-9/_.-]+(?<!\.)(?<!\/)(?<!\.lock)$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^(?!.*\.\.)(?!.*\\/\\/)(?!\\/)[a-zA-Z0-9\/_.-]+(?<!\.)(?<!\\/)(?<!\.lock)$/', $value)) {
    echo "valid";
}

java

String pattern = "^(?!.*\\.\\.)(?!.*\\/\\/)(?!\\/)[a-zA-Z0-9/_.-]+(?<!\\.)(?<!\\/)(?<!\\.lock)$";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

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