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Strange behaviour of strings.TrimLeft #18160

pikoscielniak opened this issue Dec 2, 2016 · 2 comments

Strange behaviour of strings.TrimLeft #18160

pikoscielniak opened this issue Dec 2, 2016 · 2 comments


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@pikoscielniak pikoscielniak commented Dec 2, 2016

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?


What operating system and processor architecture are you using (go env)?


What did you do?

I executed following test:

import (

func TestTrimLeft(t *testing.T) {
	trimed := strings.TrimLeft("record:edocument", "record:")

	if trimed != "edocument" {
		t.Fatalf("Expected 'edocument' got '%s' ", trimed)

What did you expect to see?

This test failed. I wouldn't expect this. Could someone explain this to me?

What did you see instead?

I got following output from this test:

Expected 'edocument' got 'ument' 
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@myitcv myitcv commented Dec 2, 2016

@pikoscielniak you want TrimPrefix and not TrimLeft

Please also consider asking questions like this in the go-nuts mailing list or other help forums as a first port of call. If the behaviour you are seeing is then confirmed as a bug/issue it can easily be re-raised here in the issue tracker.

@bradfitz bradfitz closed this Dec 2, 2016
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@pikoscielniak pikoscielniak commented Dec 2, 2016

Thanks a lot. This is what I was looking for.

@golang golang locked and limited conversation to collaborators Dec 2, 2017
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4 participants