Regex inverse matching on specific string?

Question

I would like to match the following

• com.my.company.moduleA.MyClassName
• com.my.company.moduleB.MyClassName
• c

Answer 1

Perhaps a regex is not the clearest way to write this.

if (className.startsWith("com.my.company.") 
    && !className.startsWith("com.my.company.core.")) {

}

This is fair clear what it does, and you might find it is faster. ;)