How to parse a string of version numbers in Groovy?

Question

I have a string containing a version number like major.minor.patch.build but I only want to keep major.minor.patch where each number can have 1-3 digits. How can I do this in groovy?

Examples for a result: 1.20.30.44 -> 1.20.30 or 1.21.1.1 -> 1.21.1

Answer 1

This will work for provided examples.

def majorMinorPatchBuild = '1.20.30.44'
def majorMinorPatch
if (majorMinorPatchBuild.toList().count('.') < 3) {
    majorMinorPatch = majorMinorPatchBuild
} else {
    majorMinorPatch = majorMinorPatchBuild.split('\\.')[0..-2].join('.')
}
assert majorMinorPatch == '1.20.30'

Note, you'll have to implement some error handling if the input data will have some format deviations.

---

Test on more data:

[
        '1.2.3',
        '1.2.3.4',
        '11.22.33.44',
        '111.222.333.444'
].each {
    def majorMinorPatchBuild = it
    def majorMinorPatch
    if (majorMinorPatchBuild.toList().count('.') < 3) {
        majorMinorPatch = majorMinorPatchBuild
    } else {
        majorMinorPatch = majorMinorPatchBuild.split('\\.')[0..-2].join('.')
    }

    println("major.minor.patch: '$it' -> '$majorMinorPatch'")
}

Output:

major.minor.patch: '1.2.3' -> '1.2.3'
major.minor.patch: '1.2.3.4' -> '1.2.3'
major.minor.patch: '11.22.33.44' -> '11.22.33'
major.minor.patch: '111.222.333.444' -> '111.222.333'