Code & Markup · In-Browser Regular Expression Lab

Semantic Version Regex — Match MAJOR.MINOR.PATCH with Pre-release

Full SemVer 2.0.0 specification regex validating major, minor, patch, and optional pre-release/build tags.

Pattern:

Regular Expression Pattern & Flags

Flags:

//none

Live Test String

Match Found

Load Sample:

Match Inspection & Details1 match

Match #1:1.0.0

Test Samples Verification Matrix

Expected Valid Samples (Should Match)

1.0.0 Pass

2.14.3-beta.1 Pass

0.4.0+build.1882 Pass

3.0.0-rc.2+sha.5114f85 Pass

Expected Invalid Samples (Must Reject)

1.0 Rejected (Pass)

01.2.3 Rejected (Pass)

v1.0.0 Rejected (Pass)

1.2.3.4 Rejected (Pass)

Code Implementation Generator

// JavaScript / TypeScript (ES6+)
const pattern = /^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/;
const text = "1.0.0";

const isMatch = pattern.test(text);
console.log("Is Match:", isMatch);

if (isMatch) {
  const matches = text.match(pattern);
  console.log("Matches:", matches);
}

Regular Expression Token Breakdown

Checks 3 non-negative integer numbers without leading zeros, plus optional pre-release and build metadata. Each component of the regular expression serves a distinct syntactical purpose as mapped below:

Token Pattern	Name / Component	Function & Rule
(0\|[1-9]\d*)	Major version	Non-negative integer without leading zeroes.
\.(0\|[1-9]\d*)	Minor version	Minor number component.
\.(0\|[1-9]\d*)	Patch version	Patch number component.
(?:-...	Pre-release	Optional hyphen-separated tags like -alpha.1 or -beta.
(?:\+...	Build metadata	Optional plus-separated build hashes.

Frequently Asked Questions

How to permit leading 'v'?

Prefix the pattern with `^v?`.

Browse All 40 Patterns

Code & Markup

Docker Image Name & Tag

Validates Docker image references such as repository/image:tag or standard official tags.

/^(?:(?=[^:\/]{1,253})(?!-)[a-zA-Z0-9-]{1,63}(?<!-)(?:\.(?!-)[a-zA-Z0-9-]{1,63}(?<!-))*(?::[0-9]{1,5})?\/)?(?:[a-z0-9]+(?:(?:(?:[._]|__|[-]*)[a-z0-9]+)+)?\/)*[a-z0-9]+(?:(?:(?:[._]|__|[-]*)[a-z0-9]+)+)?(?::[\w][\w.-]{0,127})?$/

Test regex

Code & Markup