How to check is Jenkins pram contains a character - regex

Question

I am trying to check if my Jenkins parameter contains a hostname.
But when I use Regular Expressions to see if it contains the name it doesn't check.
I would guess I have an error in the way I am checking or how I have it wrapped in brackets.
Below is a sample of what I am working with
stage('Release 1') {
when {
expression { params.SECRET_NAME != "" && params.STAGING_ENV != ("*some.host.name*") }
}
steps {
echo "Release 1"
}
}
stage('Release 2') {
when {
expression {params.STAGING_ENV == ("*some.host.name*") && params.SECRET_NAME == ("*+*") }
}
steps {
echo "Release 2"
}
}
}
I want it to skip the stage in my Jenkins pipeline if it does not meet the conditions

Answer 1

Ok, you need multiple changes here, from inside out:
Replace the * with .*. Simply put, in regex * denotes the same (set) of characters any number of times (abc* matches abccccc), whereas .* denotes any character any number of times (abc.* matches abccccc, abcdefg, abcadkhsdalksd, etc.).
Remove the double quotes " surrounding the regex patterns; lest you want them to be interpreted as string literals.
Wrap the regex patterns within delimiters, usually / to define the string boundary.
The brackets () themselves are optional here.
To match regular expressions, replace the equal operator == with the match operator ==~ (strict), which returns a boolean.
There is no "NOT match" operator in Groovy. To invert the match, you need to invert the result of the entire expression.
If the + in *+*should be a literal, then you must escape it as *\+*.
Stitching these together, your pipeline should look like:
stage('Release 1') {
when {
expression {
params.SECRET_NAME != "" && !(params.STAGING_ENV ==~ /.*some.host.name.*/)
}
}
steps {
echo "Release 1"
}
}
stage('Release 2') {
when {
expression {
params.STAGING_ENV ==~ /.*some.host.name.*/ && params.SECRET_NAME ==~ /.*\+.*/
}
}
steps {
echo "Release 2"
}
}
Further reading:
http://docs.groovy-lang.org/latest/html/documentation/core-operators.html
http://web.mit.edu/hackl/www/lab/turkshop/slides/regex-cheatsheet.pdf