regex101: GIT commit title naming convention (strict), conforms to Conventional Commits

Pro

1st Alternative^(((I|i)nitial|(F|f)irst)\scommit)

^start of line

Group 1(((I|i)nitial|(F|f)irst)\scommit)

Group 2((I|i)nitial|(F|f)irst)

1st Alternative(I|i)nitial

Group 3(I|i)

1st AlternativeI

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

2nd Alternativei

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

nitialthe literal text nitial (case sensitive)

2nd Alternative(F|f)irst

Group 4(F|f)

1st AlternativeF

Fthe literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive)

2nd Alternativef

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

irstthe literal text irst (case sensitive)

\sany whitespace character

committhe literal text commit (case sensitive)

2nd Alternative((I|i)nit)$

Group 5((I|i)nit)

Group 6(I|i)

1st AlternativeI

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

2nd Alternativei

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

nitthe literal text nit (case sensitive)

$end of line

3rd Alternative^(?=.{6,72}$)(feat|(bug|hot)?fix|docs|perf|style|wip|test|revert|chore|ci|refactor|build)($[a-zA-Z0-9\-\s,]{1,50}$)?:\s(.{1,50})$

^start of line

Positive Lookahead(?=.{6,72}$)

.{6,72}any character (except for line terminators), repeated between 6 and 72 times

$end of line

1st Alternativefeat

featthe literal text feat (case sensitive)

2nd Alternative(bug|hot)?fix

Group 8(bug|hot)?

?repeats the group contents below at most once:

1st Alternativebug

bugthe literal text bug (case sensitive)

2nd Alternativehot

hotthe literal text hot (case sensitive)

fixthe literal text fix (case sensitive)

3rd Alternativedocs

docsthe literal text docs (case sensitive)

4th Alternativeperf

5th Alternativestyle

6th Alternativewip

7th Alternativetest

8th Alternativerevert

9th Alternativechore

10th Alternativeci

11th Alternativerefactor

12th Alternativebuild

Group 9($[a-zA-Z0-9\-\s,]{1,50}$)?

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

Group 10(.{1,50})

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

^(((I|i)nitial|(F|f)irst)\scommit)|((I|i)nit)$|^(?=.{6,72}$)(feat|(bug|hot)?fix|docs|perf|style|wip|test|revert|chore|ci|refactor|build)(\([a-zA-Z0-9\-\s,]{1,50}\))?:\s(.{1,50})$

New

?# https://www.conventionalcommits.org/en/v1.0.0/

Initial commit
initial commit
Init
init
First commit
first commit

?# Correct
feat(foo): new feature
bugfix(bar): fix this and that
docs(foo): document new feature
docs(foo, egg): multiple scopes is fine
feat: no scope here

?# Wrong

feat:missing a space
docs(): no empty scope
fix(/.%): invalid characters
Initial
initial