Regular Expressions 101

Pro

^start of line

Group 1(arn:(?:aws|aws-cn|aws-us-gov):[\w\d-]+:[\w\d-]*:\d{0,12}:[\w\d-]*\/?[\w\d-]*)

arn:the literal text arn: (case sensitive)

Non-Capturing Group(?:aws|aws-cn|aws-us-gov)

1st Alternativeaws

awsthe literal text aws (case sensitive)

2nd Alternativeaws-cn

aws-cnthe literal text aws-cn (case sensitive)

3rd Alternativeaws-us-gov

aws-us-govthe literal text aws-us-gov (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\w\d-]+

+matches at least one character from the set below:

\wany word character

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\w\d-]*

*matches any number of characters from the set below:

\wany word character

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{0,12}a digit, repeated between 0 and 12 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\w\d-]*

*matches any number of characters from the set below:

\wany word character

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[\w\d-]*

*matches any number of characters from the set below:

\wany word character

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(\/.*)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*any character (except for line terminators), repeated any number of times

$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

No unit tests · Add a test to get started

26 tokens

Regular Expression

^(arn:(?:aws|aws-cn|aws-us-gov):[\w\d-]+:[\w\d-]*:\d{0,12}:[\w\d-]*\/?[\w\d-]*)(\/.*)?.*$

Unit Tests

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