bash regex to match semantic version number

Question

I have the following:

versionNumber=$(sw_vers -productVersion) # Finds version number

versionShort=${versionNumber:0:4}  # Cut string to 1 decimal place for calculation

which works when versions are like this:

10.9.2
10.9.5

but it will not match

10.10.3

as it will return only

10.1

but I want the versionShort to be set to

10.10

I am wanting to match the major version, the first dot and the minor version as above.

Aleks-Daniel Jakimenko-A. · Accepted Answer · 2014-06-20 15:23:07Z

17

Regexp solution:

[[ $versionNumber =~ ^[0-9]+\.[0-9]+ ]] && echo "${BASH_REMATCH[0]}"

It will always print first two numbers, for example all these:

10.5
10.5.9
10.5.8.2

Will result in 10.5 output. You can also add an else clause to check if something wrong happened (no match found).

Here is a longer version:

if [[ $versionNumber =~ ^[0-9]+\.[0-9]+ ]]; then
    versionShort=${BASH_REMATCH[0]}
else
    echo "Something is wrong with your version" >&2
fi

edited Jun 20, 2014 at 15:23

answered Jun 20, 2014 at 3:11

Aleks-Daniel Jakimenko-A.

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5 Comments

lukemh Over a year ago

how do i return the result to a variable?

Aleks-Daniel Jakimenko-A. Over a year ago

@lukemh I have added a longer version that might be clearer for you. If it does not work... are you sure that you're using bash? If yes, then which version? In version 3 you have to put right side of the conditional expression into a variable.

Mike Samuel Over a year ago

semantic version tags must have exactly 3 numbers.

Aleks-Daniel Jakimenko-A. Over a year ago

@MikeSamuel yes, that's right. Feel free to edit the answer. I wish it was easier to delete it altogether, but mentioning BASH_REMATCH is a worthy goal, even with a bad answer like this.

Aleks-Daniel Jakimenko-A. Over a year ago

… or write your own, and I'll delete mine :)

Amadan · Accepted Answer · 2014-06-20 02:09:11Z

15

Regexpless solution - cut off last dot and whatever follows it:

versionShort=${versionNumber%.*}

answered Jun 20, 2014 at 2:09

Amadan

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1 Comment

Chris Over a year ago

Careful, this doesn't work when using semver versions with a prerelease suffix like 10.9.5-rc.1

n8felton · Accepted Answer · 2016-03-09 21:40:39Z

13

I had a similar question, but I needed access to all 3 segments. I did a bit of research and testing and I found this to work well

product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
major="${semver[0]}"
minor="${semver[1]}"
patch="${semver[2]}"
echo "${major}.${minor}.${patch}"

To answer this question directly, you could

product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
major="${semver[0]}"
minor="${semver[1]}"
patch="${semver[2]}"
versionShort="${major}.${minor}"

or you can use less variables

product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
versionShort="${semver[0]}.${semver[1]}"

answered Mar 9, 2016 at 21:40

n8felton

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2 Comments

Jason Harrison Over a year ago

How does "semver=( ${product_version//./ } )" work? I unfortunately get semver="10.11.6//./" when I try this.

VasiliNovikov Over a year ago

@JasonHarrison the code works by replacing dot "." with space " ", and then taking all the arguments as a bash array. In order for it to work you need to assign the semver text to a variable first. For example, a="10.11.6"; semver=( ${a//./ } )

rhinoceros.xn · Accepted Answer · 2018-05-25 12:49:02Z

9

https://github.com/fsaintjacques/semver-tool https://github.com/fsaintjacques/semver-tool/blob/master/src/semver

SEMVER_REGEX="^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"


function validate-version {
  local version=$1
  if [[ "$version" =~ $SEMVER_REGEX ]]; then
    # if a second argument is passed, store the result in var named by $2
    if [ "$#" -eq "2" ]; then
      local major=${BASH_REMATCH[1]}
      local minor=${BASH_REMATCH[2]}
      local patch=${BASH_REMATCH[3]}
      local prere=${BASH_REMATCH[4]}
      local build=${BASH_REMATCH[5]}
      eval "$2=(\"$major\" \"$minor\" \"$patch\" \"$prere\" \"$build\")"
    else
      echo "$version"
    fi
  else
    error "version $version does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'. See help for more information."
  fi
}

answered May 25, 2018 at 12:49

rhinoceros.xn

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1 Comment

ItalyPaleAle Over a year ago

Note: this snippet contains code that is licensed under GNU GPL v3: github.com/fsaintjacques/semver-tool/blob/master/LICENSE

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