Regular Expressions 101

Explanation

Pro

^start of line

Group branchType(?<branchType>hotfix|feature|maint)

1st Alternativehotfix

hotfixthe literal text hotfix (case sensitive)

2nd Alternativefeature

featurethe literal text feature (case sensitive)

3rd Alternativemaint

maintthe literal text maint (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group tasMaMi(?<tasMaMi>(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)(?<isTest>-test)?)

Non-Capturing Group(?:0|[1-9]\d*)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9]\d*

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:0|[1-9]\d*)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9]\d*

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

Group isTest(?<isTest>-test)?

?repeats the group contents below at most once:

-testthe literal text -test (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group branchName(?<branchName>[\w\-\.\d]{1,30})

Character Class[\w\-\.\d]{1,30}

{1,30}matches between 1 and 30 characters from the set below:

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

$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

Unit Test Summary

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Quick Reference

27 tokens

Regular Expression

^(?<branchType>hotfix|feature|maint)\/(?<tasMaMi>(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)(?<isTest>-test)?)\/(?<branchName>[\w\-\.\d]{1,30})$

Unit Tests

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