What is the regex for slack channel name?

The regex pattern for slack channel name is `^[a-z0-9][a-z0-9_-]{0,79}$`. This pattern validates valid slack channel name (lowercase, max 80 chars).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^[a-z0-9][a-z0-9_-]{0,79}$/;` 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-z0-9][a-z0-9_-]{0,79}$', 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-z0-9][a-z0-9_-]{0,79}$/i`) or use `re.IGNORECASE` in Python.

Regex for Slack Channel Name

Regex Pattern

^[a-z0-9][a-z0-9_-]{0,79}$

Valid Slack channel name (lowercase, max 80 chars)

Quick Answer

The regex pattern for slack channel name is `^[a-z0-9][a-z0-9_-]{0,79}$`. Valid Slack channel name (lowercase, max 80 chars). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
general	✓ Matches
team-engineering	✓ Matches
project_alpha	✓ Matches
General	✗ No match
#channel	✗ No match
-start-dash	✗ No match
has space	✗ No match

Code Examples

javascript

const regex = /^[a-z0-9][a-z0-9_-]{0,79}$/;
const isValid = regex.test(value);

python

import re
pattern = r'^[a-z0-9][a-z0-9_-]{0,79}$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^[a-z0-9][a-z0-9_-]{0,79}$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^[a-z0-9][a-z0-9_-]{0,79}$/', $value)) {
    echo "valid";
}

java

String pattern = "^[a-z0-9][a-z0-9_-]{0,79}$";
boolean isValid = value.matches(pattern);

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