Regular Expressions 101

Pro

^start of line

Group image(?P<image>[^:@]+?)

Negated Character Class[^:@]+?

+?matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Non-Capturing Group(?::(?P<tag>[^@]+?))?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group tag(?P<tag>[^@]+?)

Negated Character Class[^@]+?

+?matches at least one character outside the set below:

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Non-Capturing Group(?:@sha256:(?P<digest>.+))?

?repeats the group contents below at most once:

@sha256:the literal text @sha256: (case sensitive)

Group digest(?P<digest>.+)

.+any character (except for line terminators), repeated at least once

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?P<image>[^:@]+?)(?::(?P<tag>[^@]+?))?(?:@sha256:(?P<digest>.+))?$

New

golang:1.23.0@sha256:89a1b98608f91fe47734cac497c0d7bd0c88239f90cccd00ea47057eb09604e2
golang:1.23.0
golang@sha256:89a1b98608f91fe47734cac497c0d7bd0c88239f90cccd00ea47057eb09604e2
golang
golang@sha256:232a180dbcbcfa7250917507f3827d88a9ae89bb1cdd8fe3ac4db7b764ebb25a