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fixed regex in linked code (remove backslashes before brackets)
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bobble bubble
bobble bubble
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Very simple task: extract the region from an AWS arn.

Example:

arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

I need to extract eu-west-2

I have a working regex for this: ^(?:\[^[^:\]+]+:){3}(\[^[^:\]+]+).*

I tried this command, but it returns the entire string:

echo "arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3" | grep -oP '^(?:[^:]+:){3}([^:]+).*'

output: arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

What is wrong with the above?

Very simple task: extract the region from an AWS arn.

Example:

arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

I need to extract eu-west-2

I have a working regex for this: ^(?:\[^:\]+:){3}(\[^:\]+).*

I tried this command, but it returns the entire string:

echo "arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3" | grep -oP '^(?:[^:]+:){3}([^:]+).*'

output: arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

What is wrong with the above?

Very simple task: extract the region from an AWS arn.

Example:

arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

I need to extract eu-west-2

I have a working regex for this: ^(?:[^:]+:){3}([^:]+).*

I tried this command, but it returns the entire string:

echo "arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3" | grep -oP '^(?:[^:]+:){3}([^:]+).*'

output: arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

What is wrong with the above?

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Wiktor Stribiżew
Wiktor Stribiżew
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Kappacake
Kappacake
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Bash - Extract region from AWS arn

Very simple task: extract the region from an AWS arn.

Example:

arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

I need to extract eu-west-2

I have a working regex for this: ^(?:\[^:\]+:){3}(\[^:\]+).*

I tried this command, but it returns the entire string:

echo "arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3" | grep -oP '^(?:[^:]+:){3}([^:]+).*'

output: arn:aws:lambda:eu-west-2:12345678912:layer:my-awsome-layer:3

What is wrong with the above?