Regular Expressions 101

^start of line

i-the literal text i- (case sensitive)

Character Class[a-f0-9]{8}

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

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Non-Capturing Group(?:[a-f0-9]{9})?

?repeats the group contents below at most once:

Character Class[a-f0-9]{9}

{9}matches exactly 9 characters from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^i-[a-f0-9]{8}(?:[a-f0-9]{9})?$

New

i-ed3a2f7a
i-096e0bec99b504f82
i-0cad9e810fbd12f4f
e123g12
i-1fz5645m
i-abcdeffh