regex for negation of ends with matching

Question

I need a regex to match strings that do not end in certain terms.

Input is a bunch of Class names, like Foo, FooImpl, FooTest, FooTestSuite, etc.

I want to match anything that does not end in Test, Tests, or TestSuite.

Should Match:

• FooImpl
• FooTestImpl
• Foo

Should not match:

• FooTest
• FooTestSuite
• FooTests

I just can't get this right. What I have now is wrong so I won't even bother posting it.

Answer 1

Try a negative lookbehind if your language supports it:

/(?<!Test)(<?!Tests)(<?!TestSuite)$/

Otherwise you can simulate a negative lookbehind using a negative lookahead:

/^(?!.*(?:Test|Tests|TestSuite)$).*$/

Rubular