regex query help

[kskarthik]

Hello! I am trying to expose regex matching option for the user & i ran into a problem.

It's not actually working. Code https://gitlab.com/kskarthik/go-ifsc/-/blob/master/cmd/root.go#L113

Am i missing anything?

When i use this pattern, the program panics

kar@earth:~/my/projects/go-ifsc$ go run main.go search -m regex ^ICIC*
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0xc1a182]

goroutine 1 [running]:
ifsc/cmd.search({0xef7dc0?, 0xc000203e60}, {{0xc000203dd0, 0x1, 0x3}, {0x7ffe08fb2170, 0x5}, 0x64})
        /home/kar/my/projects/go-ifsc/cmd/root.go:148 +0x2c2
ifsc/cmd.SearchIFSC({{0xc000203dd0, 0x1, 0x3}, {0x7ffe08fb2170, 0x5}, 0x64})
        /home/kar/my/projects/go-ifsc/cmd/root.go:114 +0x433
ifsc/cmd.glob..func3(0x14dd120?, {0xc000203dd0?, 0x3?, 0x3?})
        /home/kar/my/projects/go-ifsc/cmd/search.go:34 +0x131
github.com/spf13/cobra.(*Command).execute(0x14dd120, {0xc000203d70, 0x3, 0x3})
        /home/kar/go/pkg/mod/github.com/spf13/[email protected]/command.go:944 +0x847
github.com/spf13/cobra.(*Command).ExecuteC(0x14dcb60)
        /home/kar/go/pkg/mod/github.com/spf13/[email protected]/command.go:1068 +0x3bd
github.com/spf13/cobra.(*Command).Execute(...)
        /home/kar/go/pkg/mod/github.com/spf13/[email protected]/command.go:992
ifsc/cmd.Execute()
        /home/kar/my/projects/go-ifsc/cmd/root.go:31 +0x25
main.main()
        /home/kar/my/projects/go-ifsc/main.go:8 +0x17

[metonymic-smokey]

@kskarthik thanks for reaching out.

I reproduced the panic locally with the same regex query. In this specific query, there is an error returned "zero width assertions not allowed" and hence, results was nil.
Adding error handling when dealing with returned errors in search() should fix this.

I added a log for the error:

result, err := index.Search(searchRequest)
fmt.Printf("error after query is %v \n", err)

This is the output after adding the log for the error:

aditiahuja@Aditis-MacBook-Pro go-ifsc % go run main.go search -m regex '^ICIC*'
error after query is zero width assertions not allowed 

Please let me know if you have any further questions, thanks!

[kskarthik]

Thank you very much! I have ignored to handle the err for search. My fault

[kskarthik]

@metonymic-smokey I am unable to do regex with this query https://blevesearch.com/docs/Query-String-Query/

could you help me out figuring out the right path to do so? https://gitlab.com/kskarthik/go-ifsc/-/blob/master/cmd/root.go#L113

Example:

I expect to get pattern matching for

go run main.go search -m adv '/KARB0*/'

But matching results are not returned

Although this query works:

 go run main.go search -m adv '+delhi +axis'

[metonymic-smokey]

@kskarthik I don't think you can compare the two queries, since one is regex and one isn't.

For the regex query, maybe you could try using NewRegexpQuery() for the regex query ?

[kskarthik]

@kskarthik I don't think you can compare the two queries, since one is regex and one isn't.

But, according to the docs, bleve.NewQueryStringQuery() supports regex queries too.

For the regex query, maybe you could try using NewRegexpQuery() for the regex query ?

I did try in the past. No use. But i will try once more.

[kskarthik]

@metonymic-smokey where can i find more examples of using bleve.NewRegexpQuery() ? Didn't find here https://blevesearch.com/docs/Query/

[metonymic-smokey]

Hey @kskarthik
Sorry for the delay. An example usage could be this test -

bleve/search_test.go

Line 1480 in a569e45

func TestBooleanSearchBug1185(t *testing.T) {

.

One of the query types used is regexp.

bleve/search_test.go

Lines 1574 to 1575 in a569e45

	matchAnyOwnerRegQ := NewRegexpQuery(".+")
	matchAnyOwnerRegQ.SetField("owner")

Please let me know if you need any more info, thanks!