regex101: Python Match Workspace

^start of line

i-the literal text i- (case sensitive)

Non-Capturing Group(?:[a-f\d]{8}|[a-f\d]{17})

1st Alternative[a-f\d]{8}

Character Class[a-f\d]{8}

{8}matches exactly 8 characters from the set below:

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

\da Unicode decimal digit

2nd Alternative[a-f\d]{17}

Character Class[a-f\d]{17}

{17}matches exactly 17 characters from the set below:

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

\da Unicode decimal 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

25 tokens

Regular Expression

^i-(?:[a-f\d]{8}|[a-f\d]{17})$

New

I need a regex that will be able to match AWS EC2 instance IDs. Instance IDs have the following criteria:

    Can be either 8 or 17 characters
    Should start with i-
    Followed by either a-f or 0-9

Valid instance IDs are: 
i-ed3a2f7a
i-096e0bec99b504f82
i-0cad9e810fbd12f4f

Invalid instance IDs are 
e123g12
i-1fz5645m

Substitution

I need a regex that will be able to match AWS EC2 instance IDs. Instance IDs have the following criteria:

    Can be either 8 or 17 characters
    Should start with i-
    Followed by either a-f or 0-9

Valid instance IDs are: 
i-ed3a2f7a
i-096e0bec99b504f82
i-0cad9e810fbd12f4f

Invalid instance IDs are 
e123g12
i-1fz5645m