How to get a regular expression to match files ending in ".js" but not ".test.js"?

Question

I use webpack, which accepts regular expressions to feed files to bootloaders. I want to exclude test files from the assembly, and test files end with .test.js. So, I'm looking for a regex that will match index.js, but not index.test.js.

I tried using a negative return statement with

/(?<!\.test)\.js$/

but he says the expression is unacceptable.

SyntaxError: Invalid regular expression: /(?<!\.test)\.js$/: Invalid group

Examples of file names:

index.js          // <-- should match
index.test.js     // <-- should not match
component.js      // <-- should match
component.test.js // <-- should not match

Answer 1

var re=/^(?!.*test\.js).*\.js$/;
console.log(re.test("index.test.js"));
console.log(re.test("test.js"));
console.log(re.test("someother.js"));
console.log(re.test("testt.js"));

Run code

Answer 2

There you go:

^(?!.*\.test\.js$).*\.js$

, regex101.com.

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, , JavaScript, . , lookbehinds .

Answer 3

Javascript does not support negative lookbehinds, but lookarounds:

^((?!\.test\.).)*\.js$

Demo