Text Processingflags: i

Semantic Commit Message

Validate Conventional Commits format: type(scope)!: description.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\\([a-z0-9\\-]+\\))?(!)?:\\s.+", "i");
const input = "feat(auth): add OAuth2 login";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\([a-z0-9\-]+\))?(!)?:\s.+", re.IGNORECASE)
input_text = "feat(auth): add OAuth2 login"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`(?i)^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\([a-z0-9\-]+\))?(!)?:\s.+`)
	input := `feat(auth): add OAuth2 login`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\([a-z0-9\-]+\))?(!)?:\s.+   (flags: i)

How it works

The first group captures the commit type from the allowed list. (\([a-z0-9\-]+\))? optionally captures a scope in parentheses. (!)? captures a breaking change marker. :\s requires a colon and space before the description. The i flag makes types case-insensitive.