Groovy script that returns an array of Git tags with versions

gittags.groovy

def gitTags = ("git tag").execute()

def tags = gitTags.text.readLines()
        .collect { it.split()  }
        .unique()
        .findAll { it =~ /\d+\.\d+\.\d+/ }

tags.reverse(true)

println tags

/*
        for 
        
        $ git tag
        1.0.0
        1.0.1
        2.0.1
        2.1.1
        2.1.2
        test
        
        this will return
        
        [[2.1.2], [2.1.1], [2.0.1], [1.0.1], [1.0.0]]
*/

check http://stackoverflow.com/questions/36547680/how-to-do-i-get-the-output-of-a-shell-command-executed-using-into-a-variable-fro to see how to read the Git tags in a Jenkinsfile