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Semantic Version (SemVer)Regex — Pattern, Examples & Code

^(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-]+)*))?$

What it matches / doesn't match

Matches ✅Does not match ❌
●1.0.0●1.0
●2.3.1-alpha.1●01.2.3
●0.1.0+build.456●1.0.0-

How it works

Implements the official SemVer 2.0.0 specification. The three numeric parts disallow leading zeros (except the literal 0). Optional pre-release identifiers (after -) and build metadata (after +) follow the SemVer rules for alphanumeric and hyphen characters. This is the canonical SemVer regex from semver.org.

Code Usage

JavaScript

const regex = /^(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-]+)*))?$/;
regex.test("1.0.0"); // true

Python

import re
pattern = re.compile(r'^(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-]+)*))?$')
bool(pattern.match("1.0.0"))  # True

Go

import "regexp"
r := regexp.MustCompile(`^(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-]+)*))?$`)
r.MatchString("1.0.0") // true

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FAQ

What does the Semantic Version (SemVer) regex pattern match?

Implements the official SemVer 2.0.0 specification. The three numeric parts disallow leading zeros (except the literal 0). Optional pre-release identifiers (after -) and build metadata (after +) follow the SemVer rules for alphanumeric and hyphen characters. This is the canonical SemVer regex from semver.org.

How do I use the Semantic Version (SemVer) regex in JavaScript?

const regex = /^(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-]+)*))?$/; regex.test("1.0.0"); // true

Can I use the Semantic Version (SemVer) regex in Python?

Yes. import re pattern = re.compile(r'^(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-]+)*))?$') bool(pattern.match("1.0.0")) # True