ripgrep misses a match but succeeds with `-S` and `-i`

[OliverUv]

What version of ripgrep are you using?

ripgrep 0.7.1
-AVX -SIMD

What operating system are you using ripgrep on?

Distributor ID: Ubuntu
Description:    Ubuntu 17.10
Release:        17.10
Codename:       artful

> uname -srvpoi
Linux 4.13.0-31-generic #34-Ubuntu SMP Fri Jan 19 16:34:46 UTC 2018 x86_64 x86_64 GNU/Linux

If this is a bug, what are the steps to reproduce the behavior?

Download rgbug.tar.gz, unpack, enter the contained directory, then search for clone_created.

If this is a bug, what is the actual behavior?

https://gist.github.com/e1af638724793b341eee4f4f9e902afd

If this is a bug, what is the expected behavior?

Following the reproduction instructions will show a result from file one.ts, it should also show a result from two.ts. If used with the -i or -S flags, both results are shown as expected.

[lilydjwg]

I get a similar issue and git bisect reports that 7dd1194 is the first bad commit.

[BurntSushi]

@lilydjwg Thanks for the bisect! That is indeed the cause of the issue. That commit updated the regex library, which had a new Boyer-Moore optimization. Apparently, the implementation of Boyer-Moore is buggy.

This should be fixed in the next release.

(The reason why -i/--ignore-case "fixes" this is because it causes a different optimization to be used instead of Boyer-Moore.)

Thanks @OliverUv for the great bug report!