Remove prefix from string in Groovy

Question

I need to remove prefix from String in Groovy if it begins the string (no action otherwise).

If prefix is groovy:

• for groovyVersion I expect Version
• for groovy I expect empty string
• for spock I expect spock

Right now I use .minus(), but when I do

'library-groovy' - 'groovy'

then as a result I get library- instead of library-groovy.

What's the groovy way to achieve what I want?

Answer 1

I dont know much about Groovy but here is my take on this one:

def reg = ~/^groovy/   //Match 'groovy' if it is at the beginning of the String
String str = 'library-groovy' - reg

println(str)

Answer 2

This is case sensitive and doesn't use a regular expression:

​def prefix = 'Groovy';
def string = 'Groovy1234';
def result = '';

if (string.startsWith(prefix)) {
    result = string.substring(prefix.size())
    print result
}