A regular expression for use with bash that captures the fragments of the Semantic Versioning Specification. This repo also contains a short bash script that runs the regex against a set of example version numbers to check its validity.
This uses bash built-in regex handling, which uses POSIX regex. Think of it as an extension to the suggested regex FAQ entry for use in bash (which doesn't have a concept of non-capturing groups).
Terse:
^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?$Human-Readable:
# Regex for a semver digit
D='0|[1-9][0-9]*'
# Regex for a semver pre-release word
PW='[0-9]*[a-zA-Z-][0-9a-zA-Z-]*'
# Regex for a semver build-metadata word
MW='[0-9a-zA-Z-]+'
if [[ "$INPUT" =~ ^($D)\.($D)\.($D)(-(($D|$PW)(\.($D|$PW))*))?(\+($MW(\.$MW)*))?$ ]]; then
MAJOR="${BASH_REMATCH[1]}"
MINOR="${BASH_REMATCH[2]:-""}"
PATCH="${BASH_REMATCH[3]:-""}"
PRE_RELEASE="${BASH_REMATCH[5]:-""}"
BUILD_METADATA="${BASH_REMATCH[10]:-""}"
fiThe individual parts are captured as follows:
- Capture group 1: Major
- Capture group 2: Minor
- Capture group 3: Patch
- Capture group 5: Prerelease
- Capture group 10: Build metadata
This repo came to life following a discussion in an issue in the semver repo on GitHub. See here.
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