Github user justinleet commented on the issue:
https://github.com/apache/incubator-metron/pull/542
What if I want to put a backslash character in my string? e.g. I want to
produce 'some \ string'.
I don't think this worked before, but it's particularly relevant because
now we're doing stuff with backslash. In particular, I don't think this worked
before because (and correct me if I'm wrong)
```
fragment SCHAR: ~['"\\\r\n];
```
This says that strings are NOT:
* Single Quote
* Double Quote
* Backslash
* Carriage Return
* Newline
Even escaping won't help this, because the backslash is outright disallowed
in strings. Is there a reason it's not allowe?
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