Identifiersflags: g

ULID

Match 26-character ULIDs (Universally Unique Lexicographically Sortable Identifiers).

Available in

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

regexengine-agnostic

\b[0-9A-HJKMNP-TV-Z]{26}\b   (flags: g)

Raw source: \b[0-9A-HJKMNP-TV-Z]{26}\b

ULIDs use Crockford Base32 which excludes I, L, O, U to avoid confusion. Exactly 26 characters, word-bounded.

Input

01ARZ3NDEKTSV4RRFFQ69G5FAV

Matches

Match MongoDB ObjectId values — 24-character hexadecimal strings.

Match AWS ARNs (Amazon Resource Names) across commercial, China, and GovCloud partitions.

Validate AWS S3 bucket names per the standard naming rules: 3–63 chars, lowercase, alphanumeric + dots + hyphens.

Match Docker image references with an explicit tag — e.g. nginx:1.21, mycorp/service:v2.3.1.